Such a move is rare, but not unprecedented. If youve never gone on a family beach vacation but youre planning one now, you could refer to it as an ā¦ How to use unprecedented in a sentence. Such an event was unprecedented in the 20th century. If something is unprecedented, it has never happened before. Discover everything about the word unprecedented in english: No one knows who is in charge or what theyre supposed to do, one said. Unemployment has reached an unprecedented level. See examples of unprecedented used in a sentence. Without previous instance; Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Something that is unprecedented is not known, experienced, or done before. Meanings, translations, synonyms, pronunciations, examples, and grammar insights - all in one comprehensive guide. Ā· according to collins english dictionary, and the american heritage unabridged dictionary of the english language, the word unprecedented is an adjective that means having ā¦ Unexampled or unparalleled. Never before known or experienced; Definition of unprecedented adjective in oxford advanced learners dictionary. It is often used to describe events, situations, or actions ā¦ She took the unprecedented step of revealing the truth about the situation. The meaning of unprecedented is having no precedent : Ā· the move has already caused confusion among federal agents tasked with tackling local crime. The term āunprecedentedā refers to something that has never happened before or is unlike anything that has occurred in the past.