rare. [f. LETHAL a. + -ITY. Cf. F. léthalité.] The condition or quality of being lethal; ability to cause death; deadliness; pl. (? nonce-use) lethal agencies.
1656. Blount, Glossogr., Lethality, mortality, frailty.
1735. J. Atkins, Voy. Guinea (1737), 104. The certain Punishment being preferable to the doubtful Lethality of the Fetish.
1890. Sat. Rev., 22 Nov., 595/1. Why a person surnamed Deathless should have succumbed to such commonplace lethalities as a horses hoof and Prince Ivans club we know not.