a mapping of a function, as a signal, that is defined in one domain, as space or time, into another domain, as wavelength or frequency, where the function is represented in terms of sines and cosines.
an integral transform, used in many branches of science, of the form F(x) = [1/√(2π)]ʃeixyf(y)dy, where the limits of integration are from –∞ to +∞ and the function F is the transform of the function f
[fawr-in-hand, fohr-] /ˈfɔr ɪnˌhænd, ˈfoʊr-/ noun 1. a long necktie to be tied in a slipknot with the ends left hanging. 2. a vehicle drawn by four horses and driven by one person. 3. a team of four horses. adjective 4. of or relating to a four-in-hand. noun 1. Also called tally-ho. a road vehicle […]
[fawr-leyn, fohr-] /ˈfɔrˌleɪn, ˈfoʊr-/ adjective 1. (of a highway) having two lanes for traffic in each direction: a four-lane thruway. noun 2. Also, four-laner [fawr-ley-ner, fohr-] /ˈfɔrˈleɪ nər, ˈfoʊr-/ (Show IPA). a four-lane highway.
[fawr-leg-id, -legd, fohr-] /ˈfɔrˈlɛg ɪd, -ˈlɛgd, ˈfoʊr-/ adjective 1. having four legs. 2. Nautical. (of a schooner) having four masts.
- Four-leaf clover
[fawr-leef, fohr-] /ˈfɔrˌlif, ˈfoʊr-/ noun 1. a clover leaf having four leaflets instead of the usual three, purported to bring good luck. noun 1. a clover with four leaves rather than three, supposed to bring good luck 2. another name for cloverleaf (sense 1)