tierce

(noun) the third canonical hour; about 9 a.m.. Synonyms: terce.

(noun) the cardinal number that is the sum of one and one and one. Synonyms: three, 3, III, trio, threesome, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace.

(noun) one of three equal parts of a divisible whole. Synonyms: one-third, third. Example: "It contains approximately a third of the minimum daily requirement."