WordWeb Online

1. The third canonical hour; about 9 a.m.
   - terce
    
2. The cardinal number that is the sum of one and one and one
   - three, 3, III, trio, threesome, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace
    
3. One of three equal parts of a divisible whole
   - one-third, third

Derived forms: tierces

Type of: canonical hour, common fraction, digit, figure, simple fraction, vulgar fraction [Brit]

Encyclopedia: Tierce