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A Block

  1. A substantial, often approximately cuboid, piece of any substance.
    1. A chopping block: a cuboid base for cutting or beheading.
    2. A wig block: a simplified head model upon which wigs are worn.
    3. A mould on which hats, bonnets, etc., are shaped.
    4. (printing, dated) A piece of hard wood on which a stereotype or electrotype plate is mounted.
    5. A case or frame housing one or more sheaves (pulleys), used with ropes to increase or redirect force, for example as part of lifting gear or a sailing ship's rigging.
    6. A section of split logs used as fuel.
    7. A set of sheets (of paper) joined together at one end, forming a cuboid shape.
    8. (falconry) The perch on which a bird of prey is kept.
  2. A physical area or extent of something, often rectangular or approximately rectangular.
    1. (philately) A joined group of four (or in some cases nine) postage stamps, forming a roughly square shape.
    2. (viticulture) A discrete group of vines in a vineyard, often distinguished from others by variety, clone, canopy training method, irrigation infrastructure, or some combination thereof.
  3. A logical extent or region; a grouping or apportionment of like things treated together as a unit.
    1. (computing) A logical data storage unit containing one or more physical sectors (see cluster).
    2. (programming) A region of code in a program that acts as a single unit, such as a function or loop.
    3. (cryptography) A fixed-length group of bits making up part of a message.
    4. (chemistry) A portion of a macromolecule, comprising many units, that has at least one feature not present in adjacent portions.
    5. (rail transport) A section of a railroad where the block system is used.
    6. (computing) A contiguous range of Unicode code points used to encode characters of a specific type; can be of any size evenly divisible by 16, up to 65,536 (a full plane).
  4. A contiguous group of urban lots of property, typically several acres in extent, not crossed by public streets.
    1. The distance from one street to another in a city or suburb that is built (approximately) to a grid pattern.
  5. A roughly cuboid building.
    1. A cellblock.
  6. Something that prevents something from passing. Synonyms: barrier, blockage, obstruction
    1. Interference or obstruction of cognitive processes.
    2. (sports) An action to interfere with the movement of an opposing player or of the object of play (ball, puck).
      1. (cricket) A shot played by holding the bat vertically in the path of the ball, so that it loses momentum and drops to the ground.
      2. (cricket) The position of a player or bat when guarding the wicket.
      3. (cricket) A blockhole.
      4. (cricket) The popping crease.
      5. (volleyball) A defensive play by one or more players meant to deflect a spiked ball back to the hitter’s court.

Synonyms: stuff, roof, wall

    1. A temporary or permanent ban that prevents access to an online account or service, or connection to or from a designated telephone number, IP address, or similar.
  2. (slang) The human head.I'll knock your block off!
  3. (Britain) Solitary confinement.
  4. (obsolete) A blockhead; a stupid fellow; a dolt.