The basic form of a word used as a dictionary entry (of any part of speech, but especially of a verb).
The canonical form of an inflected word; i.e., the form usually found as the headword in a dictionary, such as the nominative singular of a noun, the bare infinitive of a verb, etc.
The outer shell of a fruit or similar body.
One of the specialized bracts around the floret in grasses.
A proposition proved or accepted for immediate use in the proof of some other proposition.
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.