Definition of projection rule in English:

projection rule

noun

Linguistics
  • (In transformational grammar) a rule for relating the semantic structure associated with a lexical item to the syntactic structure or structures in which it is used; (sometimes more specifically) a rule for obtaining the semantic value of a whole sentence by combining the semantic values of its parts in accordance with its grammatical structure.

Origin

1960s; earliest use found in Jerrold Katz (b. 1932).