/ ˈtrɪpl; NAmE / adjective , verb
■ adjective [ only before noun ]
1.
having three parts or involving three people or groups :
a triple heart bypass operation
a triple alliance
They're showing a triple bill of horror movies (= three horror movies one after the other) .
2.
three times as much or as many as sth :
The amount of alcohol in his blood was triple the legal maximum.
Its population is about triple that of Venice.
► triply / ˈtrɪpli; NAmE / adverb
■ verb
to become, or to make sth, three times as much or as many
SYN treble :
[ v ]
Output should triple by next year.
[also vn ]
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WORD ORIGIN
Middle English (as an adjective and adverb): from Old French , or from Latin triplus , from Greek triplous .