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Definition of flat
flat - adj. commercially inactive; not reflecting light; not glossy; (of a tire) completely or partially deflated; having a relatively broad surface in relation to depth or thickness; having a surface without slope, tilt in which no part is higher or lower than another; lacking contrast or shading between tones; horizontally level; stretched out and lying at full length along the ground; sounded or spoken in a tone unvarying in pitch; lowered in pitch by one chromatic semitone; (of taxes) not increasing as the amount taxed increases; having lost effervescence; lacking the expected range or depth; not designed to give an illusion or depth; not modified or restricted by reservations; lacking stimulating characteristics; uninteresting; lacking taste or flavor or tang; flattened laterally along the whole length (e.g., certain leafstalks or flatfishes); adv. with flat sails; in a forthright manner; candidly or frankly; noun scenery consisting of a wooden frame covered with painted canvas; part of a stage setting; a deflated pneumatic tire; a shallow box in which seedlings are started; a musical notation indicating one half step lower than the note named; a level tract of land; a suite of rooms usually on one floor of an apartment house; freight car without permanent sides or roof.
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