block 1. (unit) A unit of data or memory, often, but not exclusively, on a magnetic disk or magnetic tape.
Compare record, sector. Last updated: 2000-07-17
2. (operating system) To delay or sit idle while waiting for something. Compare busy-wait. Last updated: 2000-07-17
3. (programming) A delimited section of source code in a block-structured language. Last updated: 2004-09-29