Lewis & Short

offensātĭo, ōnis, f. [offenso], a hitting or striking against any thing (post-Aug.).

  1. I. Lit., Plin. 28, 16, 62, § 221: ut offensatione illā (hastae) commoneretur (Demosthenes), Quint. 11, 3, 130.
  2. II. Trop., a stumbling, tripping; a slip, blunder: debemus patienter ferre offensationes memoriae labentis, Sen. Ben. 5, 25, 6.