noun🔗ShareThe act of substituting or the state of being substituted."The substitution of the teacher for the week was announced on the school website. "processactionsystemChat with AIVocabulary GamePractice Reading
noun🔗ShareA substitute or replacement."The teacher announced a substitution for the absent Mr. Smith. "systemprocessactionChat with AIVocabulary GamePractice Reading
noun🔗ShareThe replacement of an atom, or group of atoms, in a compound, with another."The recipe called for butter, but I made a substitution and used margarine instead. "chemistrycompoundChat with AIVocabulary GamePractice Reading
