Abstract names—the names of attributes.—J. S. Mill. Abstraction—fixing thought on the point of resemblance in one body.—drawing off and contemplating separately any part of an an object.

Action—a volition followed by an effect.—J. S. Mill.

Analogy—resemblance of relation.—Whately.

Analysis—the resolution of a complex whole into its component elements. —J. S. Mill.

Argument—an expression in which, from something laid down as granted, something else is deduced—Whately.

Argumentum ad hominem—appealing to an opponent's professed views.

A priori—reasoning from cause to effect.

A posteriori—arguing from effects to cause.

Body—the unknown cause of our sensations—J. S. Mill.

Cause—the invariable antecedent, or thing going before.—the stimulus of an effect.