100 percent adjective 2adverb 2exclamation 1 adjective2 •complete, entire, wholeWe are willing to provide 100 percent mortgages.He has a 100 percent record of success. •(informal) Wholly sure; confident in one's knowledge.I'm not 100 percent on that question. adverb2 •Completely, entirely, wholly.I can assure you the we are 100 percent with you in this matter.Many retailers are now offering 100 percent natural products. •Completely well. exclamation1 •(South-Africa, slang) excellent, wonderful, magnificentYour parcel has arrived. / Ah, 100 percent!