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Related to trimestral: quarterly
1. A period or term of three months.
2. One of three terms into which an academic year is divided in some universities and colleges.
[French trimestre, from Latin trimēstris, trimēnstris, of three months : tri-, tri- + mēnsis, month; see mē- in Indo-European roots.]
tri·mes′tral (-trəl), tri·mes′tri·al (-trē-əl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.