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trepidation a condition of anxiety or dread; alarm. [2 definitions]
trespass in law, an act of entering upon or invading the property, rights, or person of another without permission and with the actual or implied use of force. [5 definitions]
tress (pl.) a woman's or girl's locks or curls of hair, usu. long and unbound. [2 definitions]
trestle a stable support formed by a horizontal beam or bar joined to the tops of two vertical members that slope or widen outward and downward. [2 definitions]
trestlework a trestle or trestle system, such as the support structure of a bridge.
trey a playing card, die, domino, or the like with three pips.
tri- three; three times.
triable subject or liable to trial in a court of law.
triacetate an acetate compound that contains three acetate groups.
triad a group of three persons or things that are similar or related. [2 definitions]
triage a system of determining priority of medical treatment, on the basis of need, chances of survival, and the like, to victims on a battlefield or in a hospital emergency ward. [2 definitions]
trial in law, an examination of evidence presented to a judicial tribunal, usu. in order to determine a person's guilt or innocence. [8 definitions]
trial and error an empirical method of solving a problem by trying out a variety of means and rejecting those that result in error.
trial balance in double-entry bookkeeping, a statement of all open debit and credit balances, usu. made to test their equality before a final statement is issued.
trial balloon any tentative action, statement, policy, or program that is released to test public opinion before a final version is put into effect. [2 definitions]
trial jury see petit jury.
triangle a geometric plane figure having three sides and three angles. [2 definitions]
triangular of, concerning, or shaped like a triangle. [3 definitions]
triangulate to make triangular or divide into triangles. [3 definitions]
triangulation a system used by navigators and surveyors to calculate the distance between two points, or the relative position of points on a plane, in which each known point is made the vertex of a triangle and each triangle is given a base line of known length. [2 definitions]
Triassic of, relating to, or designating the first geological period of the Mesozoic Era, from approximately 220 million to 180 million years ago, when volcanic activity was prominent and many reptiles, including the dinosaurs, appeared. [2 definitions]