Simple past tense and past participle of dimension.(verb)
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Use "dimensioned" in a sentence
"It is designed to work with any table format and for tabletops dimensioned at 24 to 30mm thickness."
"A M-500 shotgun is just as good as another with the right choke tube, unless of course the barrel is not straight or dimensioned incorrectly (which I understand happens more often with some cheap shotguns)."
"This was a god, a tangible, real, three-dimensioned god, who went about and ruled his world in a loin-cloth and on two bare legs, and who loved him with crooning noises in throat and mouth and with two wide-spread arms that folded him in."