a. denoting a verb when it does not require a direct object
b. denoting a verb that customarily does not require a direct object: "to faint" is an intransitive verb
c. (as noun) a verb in either of these categories
2.
denoting an adjective or noun that does not require any particular noun phrase as a referent
3.
logic, maths (of a relation) having the property that if it holds between one argument and a second, and between the second and a third, it must fail to hold between the first and the third: "being the mother of" is an intransitive relation
1612, from L.L. intransitivus "not passing over" (to another person), Priscian's term, from L. in- "not" + transitivus "that may pass over," from transire "to pass over" (see transitive).