One of the mysteries of the English language finally explained.
A notion of something before actual experience of or acquaintance with it; a preconceived idea; preconception.
Late 16th century (in an earlier sense). From classical Latin praenōtiōn-, praenōtiō previous notion, preconception, innate idea, in post-classical Latin also foreknowledge, either from prae- + nōtiō or from praenōt-, past participial stem of praenōscere to get to know beforehand + -iō.
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