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constraint

/kənˈstreɪnt//kənˈstreɪnt/·noun
a limitation or restriction on what can be done
Fig. 1 — Something inside the box wants only to get bigger, and the box will not have it.
01Definition

A constraint is a limit you must work within — from the Latin constringere, 'to bind tightly'. Budgets, deadlines, laws, and the laws of physics are all constraints: they fence off some options and force a choice among the rest. The word is neutral, even useful — designers speak of creative constraints that focus the imagination. But a constraint always exists to impede free movement in some direction, binding action the way walls bind a room; lift it, and what it served to suppress springs loose.

02In use
  • iTight budget constraints forced the team to cut the project in half.
  • iiWorking within the constraints of the sonnet, the poet still found room to surprise.
  • iiiTime was the binding constraint, and every plan had to respect it.
03Collocations
  • budget constraints
  • time constraints
  • within the constraints of
  • impose a constraint

Family constrain (verb) · constrained (adjective)

04Relations

=restriction, limitation, restraint, curb, limit, parameter

≠freedom, latitude, leeway

05Compared
PairThe difference
constraint vs constrainneed a verb, something limiting something → constrain; need a noun, the limit itself → constraint.
06TOEFL & IELTS

Indispensable for IELTS Writing Task 2 and TOEFL integrated tasks about limits — 'financial/time/resource constraints' are ready-made collocations. The verb 'constrain' and adjective 'constrained' ('a constrained budget') are common too. In academic English, 'within the constraints of' is a precise way to acknowledge limits before proposing a solution. The plural 'constraints' is often what appears.

07Asked
What is the difference between constraint and restraint?
A constraint limits your options from outside — a budget, a deadline, a law: you work within it. A restraint holds something back from acting — a seatbelt, a court order, or your own self-restraint. The direction is the tell: constraints fence the field you play on; restraints grip the player. You design under constraints; you show restraint.
What does 'due to time constraints' mean?
That the clock, not the will, cut the scope: items dropped, questions unanswered, corners chosen. It is the polite fixed phrase of agendas and papers — and note the plural: English treats constraints as coming in sets, so 'time constraints' outnumbers the singular even when only one deadline is doing the constraining.
What is a constraint in databases and programming?
A rule the data must obey: a primary-key constraint says every row needs a unique identity, a foreign-key constraint says a reference must point at something real, a check constraint bounds a value. Tech borrowed the word faithfully — a fence around what is allowed, enforced automatically rather than by willpower.
What is the difference between a constraint and a limitation?
A limitation is a shortfall in the thing itself — what it cannot do ('the study's limitations'). A constraint is a boundary imposed from outside that the thing must work within ('funding constraints'). A weak battery is a limitation; a locked budget is a constraint. Papers confess limitations; they negotiate constraints.
What are creative constraints?
Deliberately accepted limits that sharpen invention rather than block it — a sonnet's fourteen lines, a haiku's seventeen syllables, a design brief's single colour. The paradox is old and well attested: total freedom scatters effort, while a firm boundary concentrates it. The scene above knows the mechanics — the force inside the box is never spent, only fenced.
Where does constraint come from?
From Latin constringere, 'to bind tightly' — and the family it belongs to still binds: strain, strict, stringent and restrict all descend from the same stringere. Every member carries the same physical picture of a cord pulled tight; constraint is simply that cord drawn around a set of options.