lemma
n//ˈlɛmə//lemma, uppslagsord, grundform
(mathematics) A proposition proved or accepted for immediate use in the proof of some other proposition.
(psycholinguistics) The theoretical abstract conceptual form of a word, representing a specific meaning, before the creation of a specific phonological form as the sounds of a lexeme, which may find representation in a specific written form as a dictionary or lexicographic word.