The predicative/plain form of a verb or adjective used at the end of a sentence (grammar term). For verbs, this often corresponds to the dictionary form.
「食べる」は動詞の終止形で、文の述語として使える形だ。
"食べる" is the verb's plain (終止) form, the form that can be used as the predicate of a sentence.
形容詞の終止形は「高い」「楽しい」など、いわゆる語尾がいで終わる形だ。
Adjectives' predicative forms end with -i, like "高い" or "楽しい."
日本語の文法の問題では、終止形と連体形を区別する必要がある。
In Japanese grammar exercises, it's necessary to distinguish between the terminal (終止形) and attributive (連体形) forms.