noun
tri
treye
noun
1
(informal) Short for triathlon.
"She's training for her first tri next summer."
2
(informal) Short for triangle.
"Cut the fabric into a tri shape for the flag."
How to Use Tri
Learner’s notesIn plain EnglishA casual short form for words like triathlon or triangle.
Word Forms
tris plural, Tris plural
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She's training for her first _____ next summer.
Etymology
A shortening of longer words beginning with the "three" element that traces back to the ancient root for the number three.