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From: Webster's Revised Unabridged Dictionary (1913)

 Pair n.
 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.” --Macaulay.
 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.
 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 of stairs.”

From: Webster's Revised Unabridged Dictionary (1913)

 Slid·ing a.
 1. That slides or slips; gliding; moving smoothly.
 2. Slippery; elusory. [Obs.]
    That sliding science hath me made so bare.   --Chaucer.
 Sliding friction Mech., the resistance one body meets with in sliding along the surface of another, as distinguished from rolling friction.
 Sliding gunter Naut., a topmast arranged with metallic fittings so as to be hoisted and lowered by means of halyards.
 Sliding keel Naut, a movable keel, similar to a centeboard.
 Sliding pair. Mech. See the Note under Pair, n., 7.
 Sliding rule. Same as Slide rule, under Slide, n.
 Sliding scale. (a) A scale for raising or lowering imposts in proportion to the fall or rise of prices. (b) A variable scale of wages or of prices. (c) A slide rule.
 Sliding ways Naut., the timber guides used in launching a vessel.