Sengkang Secondary English tuition should help students write definitions that do real intellectual work. A strong definition tells the reader what kind of thing something is, what distinguishes it from nearby categories, and where the boundary starts to become difficult.
This rebuilt legacy URL now owns one distinct Secondary English job: term → category → distinguishing feature → example → non-example/boundary → precision check. Old broad promotional copy, stale local-centre wording and obsolete contact details have been removed.
eduKateSG does not claim a current Sengkang branch. Current centres are at 83 Punggol Central, Singapore 828761 and 8 Fourth Avenue, Singapore 268674. Selected Secondary English classes run in focused 3-pax small groups, typically 1.5 hours.
The Direct Answer
A useful definition frame is:
Term = category + distinguishing feature.
Example:
“A triangle is a polygon with three sides.”
Category:
polygon.
Distinguishing feature:
three sides.
A definition should be wide enough to include every true case and narrow enough to exclude nearby non-cases.
Category First
Weak:
“A bicycle is something with two wheels.”
Problem:
some motorcycles also have two wheels.
Stronger:
“A bicycle is a human-powered or pedal-assisted vehicle with two wheels arranged in line.”
The category vehicle helps locate the concept.
Distinguishing Feature
Weak:
“A library is a place with books.”
Bookshops and homes can contain books.
Stronger:
“A library is an organised collection and service that provides access to books and other information resources for reading, study or borrowing.”
The extra features separate library from nearby categories.
Definition vs Description
Description:
“The library is quiet, bright and on the second floor.”
Definition:
“A library is an organised service that gives users access to information and reading resources.”
Description tells what one example is like. Definition tells what makes the category what it is.
Definition vs Example
“The National Library is a library.”
This gives an example, not a definition.
Examples test a definition but cannot replace it.
The Circular-Definition Trap
Weak:
“A fair rule is a rule that is fair.”
The definition repeats the term.
Repair:
“A fair rule applies relevant criteria consistently and does not impose unjustified disadvantage on one group.”
Now the reader has usable features.
The Synonym Trap
“Courage means bravery.”
This may help vocabulary, but it does not explain what the concept involves.
Stronger:
“Courage is the willingness to act despite fear or risk when the action is judged worth taking.”
The definition exposes the relation between fear, action and value.
Worked Example: Responsibility
Weak:
“Responsibility is being responsible.”
Stronger:
“Responsibility is the obligation to carry out a role or answer for the consequences of one’s actions.”
Now the concept can be applied.
Worked Example: Evidence
Definition:
“Evidence is information used to support, test or challenge a claim.”
Example:
a measured result.
Non-example:
a claim repeated without support.
The example/non-example pair tests the boundary.
The Over-Broad Test
Definition:
“A vehicle is anything that moves.”
Too broad:
people, animals and clouds move.
Repair:
add the category features that distinguish vehicles.
The Too-Narrow Test
Definition:
“A vehicle is a four-wheeled machine used on roads.”
Too narrow:
excludes bicycles, trains and many other vehicles.
A strong definition should not exclude legitimate cases accidentally.
The Counterexample Test
After writing a definition, ask:
Can I find something that fits the words but should not belong?
If yes, the definition is over-broad.
Then ask:
Can I find a genuine case the definition excludes?
If yes, it is too narrow.
Necessary vs Typical Features
Typical feature:
many birds fly.
But flight is not necessary for being a bird because penguins and ostriches are birds.
A definition should avoid confusing common features with essential category boundaries.
Worked Example: Student
Weak:
“A student is a young person who goes to school.”
Problems:
- university students can be adults;
- students can learn outside conventional school settings.
Stronger:
“A student is a person formally or deliberately engaged in learning under a course, teacher, institution or structured programme.”
Operational Definition
Sometimes a task needs a measurable rule rather than a dictionary-style definition.
Vague:
“The plant is healthy.”
Operational:
“For this investigation, ‘healthy growth’ will be measured by change in height and number of new leaves over seven days.”
The definition tells us how the concept will be observed in this task.
Lexical vs Operational Definition
| Type | Job |
|---|---|
| Lexical | explain ordinary meaning |
| Operational | state how a concept is measured/tested here |
Students should know which kind the question requires.
Definition in Argument
Claim:
“The policy is successful.”
Before arguing, define:
successful by what standard?
- participation?
- cost?
- learning outcome?
- accessibility?
Many disagreements are partly definition disagreements.
Definition in Comprehension
A writer may use a word in a specialised sense.
“By ‘access’, the report means the ability to use the service independently, not merely physical proximity.”
Students should follow the passage’s defined meaning rather than a casual everyday meaning.
Definition in Summary
If a technical term is central, the summary may need a brief definition.
But do not copy a full dictionary entry if the reader only needs the relevant sense.
Definition in Expository Writing
A strong opening can define the concept before explaining it:
“A feedback loop is a process in which the output of a system influences what happens next.”
Then the writer can give positive/negative examples.
Worked Example: Bias
Weak:
“Bias is when something is biased.”
Stronger:
“Bias is a systematic tendency that favours one interpretation, group or outcome over alternatives.”
Boundary question:
Does having any opinion count as bias? Not necessarily; the definition requires a systematic tendency affecting judgement or representation.
Worked Example: Reliability
“Reliability is the degree to which a method or source produces consistent results or can be depended upon for the stated purpose.”
Boundary:
consistent does not automatically mean accurate.
A faulty scale can be consistently wrong.
The Boundary Example
A boundary example is deliberately difficult:
Term:
“game”.
Clear example:
chess.
Clear non-example:
sleeping.
Boundary case:
a solo puzzle with rules and scoring.
Boundary cases expose which features actually matter.
The Near-Neighbour Test
Define a concept against the category next to it:
fact vs opinion.
claim vs evidence.
example vs proof.
rule vs recommendation.
If the definition cannot separate near-neighbours, it needs refinement.
Definition by Negation Is Not Enough
Weak:
“Freedom is not being controlled.”
This may be part of the idea but leaves important questions unanswered:
- freedom to do what?
- from what constraint?
- within which rights/boundaries?
Positive features are needed.
Definition by List
“Fruit includes apples, oranges, pears and mangoes.”
A list gives examples but not the category rule.
Lists help test definitions, not replace them.
Definition by Function
Sometimes function is central:
“A thermometer is an instrument used to measure temperature.”
Category:
instrument.
Distinguishing function:
measures temperature.
Definition by Structure
“A sonnet is a poem traditionally organised into fourteen lines according to particular formal patterns.”
Here form/structure helps distinguish the category.
The Definition Ladder
- Name the term.
- Give the broad category.
- Add distinguishing feature(s).
- Give a clear example.
- Give a near non-example.
- Test a boundary case.
- Revise wording.
The Compression Test
Can the definition be shortened without losing a necessary feature?
If yes, remove clutter.
A definition should be precise, not inflated.
The Hidden-Criterion Test
Words such as:
- good;
- fair;
- effective;
- safe;
- successful;
- reasonable
often hide criteria.
Definition writing makes those criteria explicit.
Worked Example: Effective
Weak:
“Effective means it works.”
Stronger for a specific task:
“For this evaluation, an effective programme is one that produces the intended learning gain at a manageable cost and can be implemented consistently.”
Now the evaluation has measurable dimensions.
Worked Example: Fair
Possible definition:
“For this discussion, a fair process applies relevant rules consistently while allowing justified differences when circumstances are materially different.”
This is better than treating fairness as “everyone gets exactly the same thing”.
Definition Disputes
Two speakers may appear to disagree while using a key term differently.
Speaker A:
“Success means higher test scores.”
Speaker B:
“Success means long-term independent learning.”
Before debating evidence, clarify the definition.
The Definition Table
| Part | Question |
|---|---|
| Category | What kind of thing is it? |
| Distinguishing feature | What separates it? |
| Example | What clearly belongs? |
| Non-example | What nearby thing does not? |
| Boundary case | Where does the rule become difficult? |
Definition Writing and Vocabulary
Instead of memorising:
“reluctant = unwilling”
build:
“Reluctant describes someone who is unwilling or hesitant to do something even though the action remains possible.”
Then test:
Can a person be reluctant but still act? Yes.
This deepens word knowledge.
Definition Writing and Argument
Before an essay uses a contested word repeatedly, define it once and stay consistent.
Changing the definition halfway through creates equivocation.
Definition Writing and Editing
Ask:
Does the draft use the same term consistently?
Example:
Paragraph begins with access meaning physical proximity, then concludes using access to mean affordability.
The reasoning shifts definitions silently.
Secondary English Context
MOE’s Secondary English Language Syllabus 2020 emphasises precision, critical reading, vocabulary and purposeful explanation. Definition writing supports analytical paragraphs because it makes category boundaries and evaluation criteria explicit.
Official reference: MOE Secondary English Language Syllabus 2020.
Common Definition Failure Modes
| Symptom | Problem | Repair |
|---|---|---|
| term repeats itself | circular definition | add independent features |
| list of examples only | category rule absent | state category + difference |
| definition includes non-cases | too broad | counterexample test |
| genuine cases excluded | too narrow | broaden feature |
| typical feature treated as necessary | prototype/category confused | test exceptions |
Why Three Students Helps
One student proposes the definition, one searches for a counterexample and the third tests a boundary case. The definition survives only after all three roles agree it includes what should belong and excludes what should not.
When Sengkang Families May Consider This Support
- Essay arguments depend on vague words such as fair, effective or successful.
- Definitions repeat the term rather than explain it.
- Vocabulary knowledge remains synonym-only.
- Students cannot distinguish examples from category rules.
What Progress Should Look Like
A stronger learner can define a term through category and distinguishing features, test it against examples and counterexamples, recognise hidden criteria and revise the definition when a boundary case exposes a weakness.
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