An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Same as → principle of excluded middle.

→ law; → exclude; → middle.

The point, part, position, etc., equidistant from extremes or limits.

M.E., O.E. middel; cf. M.L.G., Du. middel, Ger. mittel, variant mid; cognate with Pers. miyân, as below; from PIE *medhyo-.

1) Miyân "within, between, center," from Mid.Pers. mayân "middle; among, between," Av. maidiia- "middle, the middle," maiδiiāna- "middle, center," maδəma- [adj.] "middle, being in the middle; middling, of a middling size or quality," maiδim "in the midst of," cf. Skt. mádhya- "middle, located in the middle;" O.H.G. mitti "located in the middle."
2) From miyân + suffix -i.

The region lying between the → troposphere and the → thermosphere comprising the → stratosphere and the → mesosphere (Meteorology Glossary, American Meteorological Society).

→ middle; → atmosphere.

Same as → mid-infrared.

→ middle; → infrared.

The latitude belt roughly between 35 and 65 degrees North and South. Also referred to as the temperate region.

→ middle; → latitude.

Logic: In a → syllogism, the categorical term occurring in both the → major term and the → minor term.

→ middle; → term.

The second principle of → formal logic introduced in Aristotle's theory of the → syllogism: A statement is either → true or → false. In other words, two → contradictory → propositions cannot both be true. The truth of one implies the falsehood of the other. Also called law of excluded middle and → principle of excluded third.

→ principle; → exclude; → middle.