ream

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To form, shape, taper, or enlarge (a hole or bore, for example) with a reamer or similar implement.
• transitive verb To remove (material) by this process.
• transitive verb To squeeze the juice out of (fruit) with a reamer.
• transitive verb Vulgar Slang To penetrate sexually.
• noun A quantity of paper, formerly 480 sheets, now 500 sheets or, in a printer's ream, 516 sheets.
• noun A very large amount.

from The Century Dictionary.

• noun Cream; also, the cream-like froth on ale or other liquor; froth or foam in general.
• To cream; mantle; foam; froth.
• To appear like foam; be fleecy.
• noun A quantity of paper, consisting, for ordinary writing-paper, of 20 quires of 24 sheets each, or 480 sheets; for some kinds of drawing-paper, of 472 or 500 sheets; for printing-paper, of 21½ quires, or 516 sheets.
• To make wide; widen; extend; extend by stretching; streteh or draw out.
• Specifically To widen or enlarge by the use of a rotatory cutter: often with out: used especially of a hole or an opening in metal, and most commonly in connection with splayed or funnel-shaped holes.
• Nautical, toopen (seams) for calking.
• To leave; quit.

from the GNU version of the Collaborative International Dictionary of English.

• noun Scot. Cream; also, the cream or froth on ale.
• intransitive verb Scot. To cream; to mantle.
• transitive verb To stretch out; to draw out into thongs, threads, or filaments.
• noun A bundle, package, or quantity of paper, usually consisting of twenty quires or 480 sheets.
• noun twenty-one and a half quires. [Eng.] A common practice is now to count five hundred sheets to the ream.
• transitive verb To bevel out, as the mouth of a hole in wood or metal; in modern usage, to enlarge or dress out, as a hole, with a reamer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb Northern England, Scotland To cream; mantle; foam; froth.
• verb To enlarge a hole, especially using a reamer; to bore a hole wider.
• verb To shape or form, especially using a reamer.
• verb To remove (material) by reaming.
• verb To remove burrs and debris from a freshly bored hole.
• verb slang To yell at or berate.
• verb slang, vulgar To sexually penetrate in a rough and painful way, by analogy with definition 1.
• noun A bundle, package, or quantity of paper, usually containing 500 sheets.
• noun An abstract large amount of something.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb enlarge with a reamer
• noun a quantity of paper; 480 or 500 sheets; one ream equals 20 quires
• verb squeeze the juice out (of a fruit) with a reamer
• noun a large quantity of written matter
• verb remove by making a hole or by boring