(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.

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

(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.

having three wheels

(amateur radio, CB) Best wishes; regards.

(plural only, informal, Canada, US, politics) Canada, Mexico, and the United States.

plural of three-legged

plural of three L