plural of obversion

Turned or facing toward the observer. / Corresponding; complementary. / (botany) Having the base, or end next to the attachment, narrower than the top.

The heads side of a coin, or the side of a medal or badge that has the principal design. / (logic) A proposition obtained by obversion, e.g. All men are mortal => No man is immortal.

plural of obverse

In an obverse manner.

The act of turning toward or downward. / (logic) An immediate inference that denies the opposite of something previously affirmed.

(obsolete) conversant; familiar