tri-

combining form

1

: three : having three elements or parts

trigraph

2

: into three

trisect

3

a

: thrice

triweekly

b

: every third

trimonthly

Word History

Etymology

Latin (from tri-, tres) & Greek, from tri-, treis — more at three

Kids Definition

tri-

combining form

1

: three : having three elements or parts

triangle

2

: into three

trisect

3

a

: three times

triweekly

b

: every third

trimonthly

Etymology

from Latin tri-, tres and Greek tri-, treis "three"