 Sherwood defines ‘signification’ as “a presentation of the form of something to the understanding”, a definition harking back to 12th-century semantic theory (Kretzmann 1966, p. 105, fn. 2). Supposition and copulation are symmetrically related to each other; ‘supposition’ is “an ordering of the understanding of something under something else” while ‘copulation’ is “an ordering of the understanding of something over something else” (Kretzmann 1966, p. 105). Only substantive nouns, pronouns, and definite descriptions can have supposition, while only adjectives, participles, and verbs can have copulation (Kretzmann 1966, p. 106).