What does 一言 mean?
一言 is a Japanese noun meaning “one word” in English. It is written as 一言 in kanji, ひとこと in hiragana, and hitokoto in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
一言で言えば、彼は馬鹿だと思います。
In a word, I think he's a fool.