| Term | Definition |
| Cognitive meaning | the meaning by which terminology conveys information |
| Emotive meaning | the meaning by which terminology expresses or evokes feelings |
| Value claim | a claim that something is good, bad, right, or wrong |
| Ambiguous expression | an expression that can be interpreted as having more than one distinct meaning in a given context |
| Term | a word or group of words that can serve as the subject of a statement |
| Intensional meaning/intension | the qualities or attributes that a term connotes |
| Extensional meaning/extension | the members of the class that a term denotes |
| Connotation | intensional meaning or intension |
| Denotation | extensional meaning or extension |
| Conventional connotation | the intensional meaning conventially agreed on by the members of the community who speak the language in question |
| Empty extension | the extension of a term that denotes something that does not exist; the null class |
| Increasing intension | the order of increasing specificity |
| Decreasing intension | the order of decreasing specificity or increasing generality |
| Increasing extension | the order of increasing class size |
| Decreasing extension | the order of decreasing class size |
| Definition | a group of words that assigns a meaning to a word or group of words |
| Definiendum | in a definition, the word or group of words that are proposed to be defined |
| Definiens | in a definition, the word or group of words that do the defining |
| Stipulative definition | a definition that assigns a meaning to a word for the first time |
| Lexical definition | a definition intended to report the way a word is actually used in a language |
| Precising definition | a definition intended to reduce the vagueness of a word |
| Persuasive definition | a definition intended to engender a favorable or unfavorable attitude toward what is denoted by the definiedum |
| Extensional (denotative) definition | a definition that assigns a meaning to a term by indication the members of the class that the term denotes |
| Demonstrative (ostensive) definition | a definition that assigns a meaning to a word by pointing to members of the class that the word denotes |
| Definition by genus and difference | A definition that assigns a meaning to a term by identifying a genus term and one or more difference words that, when combined, convey the same meaning as the term being defined |
| Operational definition | A definition that assigns a meaning to a word by specifying experimental procedures that determine whether or not the word applies to a certain thing |
| Etymological definition | A definition that assigns a meaning to a word by disclosing the word's ancestry in both its own language and other languages |
| Synonymous definition | A definition in which the definiens is a single word that connotes the same attributes as the definiendum |
| Intensional definition | A definition that assigns a meaning to a word by indicating the qualities or attributes that the word connotes |
| Definition by subclass | A definition that assigns a meaning to a term by naming subclasses of the class that the term denotes |
| Enumerative definition | A definition that assigns a meaning to a word by naming the members of the class that the word denotes |