sonant; vocal, as distinguished from a sharp (non-sonant) consonant
Not having an inflectional ending or sign, such as a noun used as an adjective, or an adjective as an adverb, without the addition of a formative suffix; or an infinitive without the sign "to".
A note played a semitone lower than a natural, denoted by the symbol ♭ placed after the letter representing the note (e.g., B♭) or in front of the note symbol (e.g. ♭♪).
From Middle English flat, a borrowing from Old Norse flatr (compare Norwegian and Swedish flat, Danish flad), from Proto-Germanic *flataz, from Proto-Indo-European *pleth₂- ("flat"); akin to Saterland Frisian flot ("smooth"), German Flöz ("a geological layer"), Ancient Greek πλατύς, Latvian plats, Sanskrit प्रथस् ("extension"). plat, and pleyt.
The noun is from Middle English flat, from the adjective.
From 1795, alteration of Scots flet ("inner part of a house"), from Middle English flet ("dwelling"), from Old English flet, flett, from Proto-Germanic *flatją ("floor"), from Proto-Germanic *flataz ("flat"), from Proto-Indo-European *pleth₂- ("flat"). Akin to Old Frisian flet ("dwelling, house"). More at flet, flat.
From Middle English flatten, from Old French flatir, from Frankish *flattjan, from Proto-Germanic *flatjaną.
Modern English dictionary
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