Four colour theorem
four colour map theorem
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- Four-corners
[fawr-kawr-nerz, fohr-] /ˈfɔrˈkɔr nərz, ˈfoʊr-/ noun, (used with a singular or plural verb) Northern and Western U.S. 1. a place where roads cross at right angles; a crossroads. noun 1. a point in the SW U.S., at the intersection of 37° N latitude and 109° W longitude, where the boundaries of four states—Arizona, Utah, Colorado, […]
- Four-corner town
noun phrase A very small town; a crossroads: We were flabbergasted by these four-corner towns with four bars (1980s+)
- Four-cycle
[fawr-sahy-kuh l, fohr-] /ˈfɔrˌsaɪ kəl, ˈfoʊr-/ adjective 1. noting or pertaining to an internal-combustion engine in which a complete cycle in each cylinder requires four strokes, one to draw in air or an air-fuel mixture, one to compress it, one to ignite it and do work, and one to scavenge the cylinder. adjective 1. (US […]
- Four-deal bridge
noun 1. a version of bridge in which four hands only are played, the players then cutting for new partners
- Four-dimensional
[fawr-di-men-shuh-nl, fohr-] /ˈfɔr dɪˈmɛn ʃə nl, ˈfoʊr-/ adjective, Mathematics. 1. of a space having points, or a set having elements, which require four coordinates for their unique determination. adjective 1. having or specified by four dimensions, esp the three spatial dimensions and the dimension of time: a four-dimensional continuum