(derogatory, somewhat occasional) Advocacy for the belief that the earth is flat.

(aviation) An especially dangerous type of spin (abnormal stalled flight mode) with a very high angle of attack (typically between 65° and 90°), such that the aircraft's nose is pointed near the horizon despite an extreme negative flightpath angle (gamma); typically unresponsive to flight control inputs and unrecoverable in most aircraft.

(sociology) a lifestyle choice and social protest movement in China by some young people who reject societal pressures

(Singapore) A build-to-order apartment under a scheme of the Singapore government, built according to demand determined by the number of applicants and their down-payment.

plural of false flat

plural of BTO flat

(of an autograph) Having the signature alone, rather than being accompanied by other words or drawings.

plural of granny flat

Alternative spelling of flatpick

Alternative form of flattop