1. A distinct element of language that functions as a complete unit in grammar, such as a word, phrase, clause, or sentence
The phoneme is the smallest grammatical unit in spoken language.
O fonema é a menor unidade gramatical da língua falada.
2. Any segment of language that has a specific grammatical function and can be analyzed according to grammatical rules
A noun phrase is a grammatical unit composed of a noun and its modifiers.
Um sintagma nominal é uma unidade gramatical composta por um nome e seus modificadores.