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1 definition found
for lower pair
From The Collaborative International Dictionary of English v.0.48 :
Pair \Pair\ (p[^a]r), n. [F. paire, LL. paria, L. paria, pl. of
par pair, fr. par, adj., equal. Cf. Apparel, Par
equality, Peer an equal.]
1. A number of things resembling one another, or belonging
together; a set; as, a pair or flight of stairs. "A pair
of beads." --Chaucer. --Beau. & Fl. "Four pair of stairs."
Note: [Now mostly or quite disused.]
Two crowns in my pocket, two pair of cards.
--Beau. & Fl.
2. Two things of a kind, similar in form, suited to each
other, and intended to be used together; as, a pair of
gloves or stockings; a pair of shoes.
3. Two of a sort; a span; a yoke; a couple; a brace; as, a
pair of horses; a pair of oxen.
4. A married couple; a man and wife. "A happy pair."
--Dryden. "The hapless pair." --Milton.
5. A single thing, composed of two pieces fitted to each
other and used together; as, a pair of scissors; a pair of
pants; a pair of tongs; a pair of bellows.
6. Two members of opposite parties or opinion, as in a
parliamentary body, who mutually agree not to vote on a
given question (in order, for example, to allow the
members to be absent during the vote without affecting the
outcome of the vote), or on issues of a party nature
during a specified time; as, there were two pairs on the
final vote. [Parliamentary Cant]
Note: A member who is thus paired with one who would have
voted oppositely is said to be paired for or paired
against a measure, depending on the member's position.
[1913 Webster +PJC]
7. (Kinematics) In a mechanism, two elements, or bodies,
which are so applied to each other as to mutually
constrain relative motion.
Note: Pairs are named in accordance with the kind of motion
they permit; thus, a journal and its bearing form a
turning pair, a cylinder and its piston a sliding
pair, a screw and its nut a twisting pair, etc. Any
pair in which the constraining contact is along lines
or at points only (as a cam and roller acting
together), is designated a higher pair; any pair
having constraining surfaces which fit each other (as a
cylindrical pin and eye, a screw and its nut, etc.), is
called a lower pair.
Pair royal (pl. Pairs Royal) three things of a sort; --
used especially of playing cards in some games, as
cribbage; as three kings, three "eight spots" etc. Four of
a kind are called a double pair royal. "Something in his
face gave me as much pleasure as a pair royal of naturals
in my own hand." --Goldsmith. "That great pair royal of
adamantine sisters [the Fates]." --Quarles. [Written
corruptly parial and prial.]
Syn: Pair, Flight, Set.
Usage: Originally, pair was not confined to two things, but
was applied to any number of equal things (pares),
that go together. Ben Jonson speaks of a pair (set) of
chessmen; also, he and Lord Bacon speak of a pair
(pack) of cards. A "pair of stairs" is still in
popular use, as well as the later expression, "flight
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