Something that constrains; a restriction. / An irresistible force or compulsion. / The repression of one's feelings. / (mathematics) A condition that a solution to an optimization problem must satisfy.

(politics) A district represented by one or more elected officials. / (collective) The voters within such a district. / (collective) The residents of such a district.

(archaic) With steadfastness; with resolve; in loyalty, faithfully. / In a constant manner; occurring continuously; persistently. / (frequency) Recurring regularly.

(law) The supreme law of some countries, such as Australia, Ireland, and the United States.

being a part, or component of a whole / authorized to make a constitution

A part, or component of a whole / A person or thing which constitutes, determines, or constructs / A resident of an area represented by an elected official, particularly in relation to that official.

simple past tense and past participle of constrain

Kept within close bounds; confined. / Forced; compelled.

(transitive, intransitive) To narrow, especially by application of pressure. / (of a snake) To coil around (prey) in order to asphyxiate it. / (figuratively) To limit or restrict.

(physics) the constant of proportionality (symbol h), relating the energy and frequency of a photon (6.626 × 10⁻³⁴ joule-seconds); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action