strenuitas
From LSJ
ψυχῆς ἀγῶνα τὸν προκείμενον πέρι δώσων → to stand the appointed trial for his life, to stand the appointed struggle for life and death
Latin > English (Lewis & Short)
strēnŭĭtas: ātis, f. strenuus,
I nimbleness, briskness, vivacity, activity (very rare; perh. only in the two foll. passages): ab strenuitate et nobilitate strenui et nobiles, Varr. L. L. 8, § 15 Müll.: strenuitas antiqua manet, Ov. M. 9, 320.