definition of
tierce

[1] #1 tierce n. [terce] the third canonical hour; about 9 a.m.. wn

[2] #2 tierce n. [three, 3, III, trio, threesome, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace] the cardinal number that is the sum of one and one and one. wn

[3] #3 tierce n. [one-third, third] one of three equal parts of a divisible whole; "it contains approximately a third of the minimum daily requirement". wn