A theory in ethics, lying between consequentialism and deontology, holding that it is never right to go against a principle unless there is a proportionate reason to justify doing so.

(topology) A map from the circle, S¹, to a topological space.^{(McLarty, p. 4})

(organic chemistry) The detection of free radicals by means of electron paramagnetic resonance spectroscopy

plural of proanthocyanidin