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In linguistics, logic, philosophy, and other fields, an intension is any property or quality connoted by a word, phrase, or another symbol. In the case of a word, the word's definition often implies an intension. The term may also refer to all such intensions collectively, although the term comprehension is technically more correct for this.
The meaning of a word can be thought of as the bond between the idea the word means and the physical form of the word. Swiss linguist Ferdinand de Saussure (1857-1913) contrasts three concepts:
Intension is analogous to the signified in the Saussurean system, extension to the referent. Without intension of some sort, words have no meaning.
Note: Intension and intensionality (the state of having intension) should not be confused with intention and intentionality, which are pronounced the same and occasionally arise in the same philosophical context. Where this happens, the letter s or t is sometimes italicized to emphasize the distinction.