 Avempace observes that “subject” and “predicate” are ambiguous terms because they may refer to meanings as well as to sounds, and what Alfarabi considers in this book are the meanings, not the sounds (IB-taaliq: 30. 6–8). According to their meaning, both parts of the sentence are either universal or individual. Avempace then follows Alfarabi and divides universal parts into simple and composite: simple parts of the sentence are genus, species, specific difference, property, and accident. Composite parts are the definition, the description, and “an expression the composition of which is restricted, and is neither a definition nor a description” (IB-taaliq: 30. 16–17). Avempace’s meaning here can only be understood by reading Alfarabi’s Eisagoge. Alfarabi defined it as an expression which