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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
3-dimensional is an adjective meaning "involving or relating to three dimensions or aspects; giving the illusion of depth". It carries one recorded sense.
involving or relating to three dimensions or aspects; giving the illusion of depth
“lifelike three-dimensional characters”
“a three-dimensional account of conditions under the new government”
“they shot the movie in three-D”
Definitions, synonyms and semantic relations for 3-dimensional come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.