Having three corners; triangular. / (botany) Having three prominent longitudinal angles.

Three of four equal parts (3/4, ¾, 0.75).

(gambling) A gambling game played with three coins.

(In both the 12-hour clock and the 24-hour clock) The start of the fourth hour of the day; 3:00 a.m. (03:00). / (Only in the 12-hour clock) The start of the sixteenth hour of the day; 3:00 p.m. (15:00).

A law student in his or her third (and usually final) year of law school.

Of or pertaining to the third year of law school.

(US, idiomatic) On an automobile (especially those produced from 1939 through the mid-1970s), a three-speed manual transmission whose gearshift lever is mounted on the steering column.

(mathematics) A vector space whose basis of real numbers has three vectors

Three of four equal parts (3/4, ¾, 0.75).

(idiomatic, humorous) Used to express agreement, after someone has already said "me too." Can be continued as "me four," "me five," and so on.