paṭikkhepa : [m.] refusal; denial; objection; negation.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Paṭikkhepa [fr. paṭi+kṣip] opposition, negation, contrary SnA 228 for "na"), 502; PvA 189 (˚vacana the opp. expression). ˚to (abl.) in opposition or contrast to PvA 24.

Pali-English Dictionary, TW Rhys Davids, William Stede,