Lewis & Short

dēfătīgātĭo or defĕt-, ōnis, f. [defatigo].

  1. I. Act., a wearying, tiring out, fatiguing, Hirt. B. G. 8, 27, 4; Cic. Sen. 23, 86; id. de Or. 3, 44; id. N. D. 2, 23, 59.
  2. II. Pass., weariness, fatigue, exhaustion, Caes. B. G. 3, 19, 3; Auct. Her. 1, 17, 27; Cic. Phil. 5, 7, 20; id. Sen. 11, 36 al.