N. counteraction, opposition, contrariety, antagonism, polarity, clashing, collision, interference, inhibition, resistance, renitency, friction, reaction, retroaction, counterblast, neutralization, vis inertiae, check, voluntary opposition, voluntary resistance, repression, opposites, action and reaction, yang and yin, yang-yin (contrariety) 14

V. counteract, run counter, clash, cross, interfere with, conflict with, contravene, jostle, go against, run against, beat against, militate against, stultify, antagonize, block, oppose, traverse, withstand, hinder, repress, react, undo, neutralize, counterpoise, overpoise

Adj. counteracting, antagonistic, conflicting, retroactive, renitent, reactionary, contrary

Adv. although, in spite of, against

Phr. "for every action there is a reaction, equal in force and opposite in direction", words relating to space 1, abstract space