Physics .

the property or characteristic that produces unequal physical effects at different points in a body or system, as a magnet or storage battery.

the positive or negative state in which a body reacts to a magnetic, electric, or other field.

the presence or manifestation of two opposite or contrasting principles or tendencies.

Linguistics .

(of words, phrases, or sentences) positive or negative character.

polar opposition.

noun

antagonism , antithesis , contradiction , contradistinction , contraposition , contrariety , contrariness