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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
overachievement is a noun meaning "better than expected performance (better than might have been predicted from intelligence tests)". It carries one recorded sense.
better than expected performance (better than might have been predicted from intelligence tests)
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 overachievement come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.