There are four types of propositions, namely (i) Universal affirmative (or A-proposition) (ii) Universal negative (or E-proposition), (iii) Particular affirmative (or I-proposition) and (iv) Particular negative (or O-proposition).
Class terms or general terms, such as 'man', 'dog', 'river' etc., have two different kinds of meaning - they apply to things and signify some properties. The things to which a term applies constitute its denotation and the common and essential properties signified by the term constitute its connotation.
An argument consists of declarative sentences. We have also noted that the declarative sentences express propositions. As a sentence consists of words, so also a proposition consists of terms.
A knowledge of a few terms is essential for studying Health Education and Community Pharmacy. The following are a few important terms and their definitions.