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say it: suh-MEH-stur
semester is a noun meaning "one of two divisions of an academic year". It carries 2 recorded senses.
one of two divisions of an academic year
half a year; a period of 6 months
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for semester come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.