20-letter words containing free
- context-free grammar — (grammar) (CFG) A grammar where the syntax of each constituent (syntactic category or terminal symbol) is independent of the symbols occuring before and after it in a sentence. A context-free grammar describes a context-free language. Context-free grammars can be expressed by a set of "production rules" or syntactic rules. For example, a language with symbols "a" and "b" that must occur in unequal numbers can be represented by the CFG: S → U | V U → TaU | TaT | UaT V → TbV | TbT | VbT T → aTbT | bTaT | ε meaning the top-level category "S" consists of either a "U" or a "V" and so on. The special category "ε" represents the empty string. This grammar is context-free because each rule has a single symbol on its left-hand side.
- free-range parenting — Informal. a style of child rearing in which parents allow their children to move about without constant adult supervision, aimed at instilling independence and self-reliance.
- freedom of the press — the right to publish newspapers, magazines, and other printed matter without governmental restriction and subject only to the laws of libel, obscenity, sedition, etc.
- freefall parachuting — a variety of parachuting in which the jumper manoeuvres in free fall before opening the parachute
- refrigerator-freezer — a large appliance housing one compartment for refrigerating food and another for freezing.
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