block -- (a solid piece of something (usually having flat rectangular sides); "the pyramids were built with large stone blocks")
block, city block -- (a rectangular area in a city surrounded by streets and usually containing several buildings; "he lives in the next block")
block, cube -- (a three-dimensional shape with six square or rectangular sides)
block -- (a number or quantity of related things dealt with as a unit; "he reserved a large block of seats"; "he held a large block of the company's stock")
block -- (housing in a large building that is divided into separate units; "there is a block of classrooms in the west wing")
block -- ((computer science) a sector or group of sectors that function as the smallest data unit permitted; "since blocks are often defined as a single sector, the terms `block' and `sector' are sometimes used interchangeably")
block, mental block -- (an inability to remember or think of something you normally can do; often caused by emotional tension; "I knew his name perfectly well but I had a temporary block")
pulley, pulley-block, pulley block, block -- (a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope)
engine block, cylinder block, block -- (a metal casting containing the cylinders and cooling ducts of an engine; "the engine had to be replaced because the block was cracked")
blockage, block, closure, occlusion, stop, stoppage -- (an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe")
auction block, block -- (a platform from which an auctioneer sells; "they put their paintings on the block")
blocking, block -- (the act of obstructing or deflecting someone's movements)
stop, halt, block, kibosh -- (stop from happening or developing; "Block his election"; "Halt the process")
jam, block -- (interfere with or prevent the reception of signals; "Jam the Voice of America"; "block the signals emitted by this station")
block -- (run on a block system; "block trains")
block -- (interrupt the normal function of by means of anesthesia; "block a nerve"; "block a muscle")
obstruct, block -- (shut out from view or get in the way so as to hide from sight; "The thick curtain blocked the action on the stage"; "The trees obstruct my view of the mountains")
block -- (stamp or emboss a title or design on a book with a block; "block the book cover")
stuff, lug, choke up, block -- (obstruct; "My nose is all stuffed"; "Her arteries are blocked")