three

Từ điển Oxford Advanced Learner 8th

three [three threes] BrE [θriː] NAmE [θriː] number
3  There are examples of how to use numbers at the entry for five.
more at in twos and threes at ↑two
Idiom: ↑three Rs

Word Origin:
Old English thrīe (masculine), thrīo, thrēo (feminine), of Germanic origin; related to Dutch drie and German drei, from an Indo-European root shared by Latin tres and Greek treis.

• Từ đồng nghĩa / Synonyms:
  trey, 3, III, trio, threesome, tierce, leash, troika, triad, trine, trinity, ternary, iii