"the act of interrogating," c. 1600, verbal noun from question (v.). Questioning pitch for "rising intonation of an interrogative sentence" is by 1906.
Entries linking to questioning
question v.
late 15c., questiounen, "to inquire, ask, seek to know," from question (n.) and from Old French questioner "ask questions, interrogate, torture" (13c.), from question (n.). Hence "to dispute, doubt," by 1530s. Transitive sense of "inquire of by asking questions" is from late 15c. Related: Questioned; questioning. Alternative verb questionize is attested from 1847.