noun

1. Thruppence, threepence, a coin valuing three pennies

adjective

1. The ordinal form of the cardinal number three; Coming after the second.

   “The third tree from the left is my favorite.”

Synonyms: 3d, 3rd, III, IIIrd

adjective

1. Existing in three dimensions

2. Having depth (or the illusion of depth) as well as height and width

3. Lifelike

Synonyms: 3-D, 3D, 3d, tri-D