Hypertext Webster Gateway: "per"

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Per- \Per-\ [See {Per}.]
1. A prefix used to signify through, throughout, by, for, or
as an intensive as perhaps, by hap or chance; perennial,
that lasts throughout the year; perforce, through or by
force; perfoliate, perforate; perspicuous, evident
throughout or very evident; perplex, literally, to
entangle very much.

2. (Chem.) Originally, denoting that the element to the name
of which it is prefixed in the respective compounds
exercised its highest valence; now, only that the element
has a higher valence than in other similar compounds;
thus, barium peroxide is the highest oxide of barium;
while nitrogen and manganese peroxides, so-called, are not
the highest oxides of those elements.

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Per \Per\, prep. [L. Cf. {Far}, {For-}, {Pardon}, and cf. {Par},
Through; by means of; through the agency of; by; for; for
each; as, per annum; per capita, by heads, or according to
individuals; per curiam, by the court; per se, by itself, of
itself. Per is also sometimes used with English words.

{Per annum}, by the year; in each successive year; annually.

{Per cent}, {Per centum}, by the hundred; in the hundred; --
used esp. of proportions of ingredients, rate or amount of
interest, and the like; commonly used in the shortened
form per cent.

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