(1) A set of consecutive character strings that specify a characteristic of an entry. There are three types of clauses: data, environment, and file.
(2) The fundamental grouping of REXX syntax. A clause is composed of zero or more blanks, a sequence of tokens, zero or more blanks, and the semicolon delimiter.
(3) In SQL, a distinct part of a statement in the language structure, such as a SELECT clause or a WHERE clause.