A first-order predicate (also called a monad) is a predicate that takes only individual(s) constants or variables as argument(s). Compare second-order predicate and higher-order predicate.
Famous quotes containing the word predicate:
“The predicate of truth-value of a proposition, therefore, is a mere fictive quality; its place is in an ideal world of science only, whereas actual science cannot make use of it. Actual science instead employs throughout the predicate of weight.”
—Hans Reichenbach (1891–1953)