Crossword Genius

Period of three months (9)

Ross

I believe the answer is:

trimester

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">period of three months</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for trimester that I've seen before include "Period of three months" , "part of college year" , "US academic term" , "academic session" , "American term" .)

I've seen this clue in The Times and the Sydney Morning Herald.
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