cover

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cover

1. woods or bushes providing shelter or a habitat for wild creatures
2. 
a. a blanket used on a bed for warmth
b. another word for bedspread
3. Philately
a. an entire envelope that has been postmarked
b. on cover (of a postage stamp) kept in this form by collectors
4. Pop music a version by a different artist of a previously recorded musical item
5. Cricket
a. the area more or less at right angles to the pitch on the off side and usually about halfway to the boundary
b. (as modifier): a cover drive by a batsman
c. a fielder in such a position
6. Ecology the percentage of the ground surface covered by a given species of plant
7. break cover (esp of game animals) to come out from a shelter or hiding place
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Cover

In reinforced concrete, the thickness of concrete over-lying the steel bars nearest the surface. An adequate layer is needed to protect the reinforcement from rusting and from fire.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Cover

 

(or covering), a collection of point sets (geometric figures) whose union forms or contains a given set (or given figure). For example, the diagonal of a rectangle divides it into two triangles that form a cover of the given rectangle. Finite covers—that is, covers consisting of a finite number of elements —are usually considered. If the diameter of each of the sets of a cover is smaller than a given positive ∊, the cover is called an ∊-cover.

For any ∊ > 0, a bounded region permits of a finite ∊-cover by closed sets with at most three sets intersecting at a time, but it permits of no such cover, for a sufficiently small ∊, with only two sets intersecting at a time. Thus, a town square can be covered with arbitrarily small paving blocks in such a way that the stones in the pavement will border only in threes; borderings in threes cannot be avoided. Similarly, when a space is filled with brickwork, the bricks can be made to border only in fours; the borderings cannot be only in threes. Hence, the importance of the concept of the multiplicity of a cover. We say that the multiplicity of a cover of a given set does not exceed n if every point of the set belongs to no more than n sets of the cover. Thus, the multiplicity of finite covers makes it possible to characterize the number of dimensions of a space. In topology, covers are a powerful means of investigating various geometric properties of sets.

P. S. ALEKSANDROV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

cover

[′kəv·ər]
(mathematics)
An element, x, of a partially ordered set covers another element y if x is greater than y, and the only elements that are both greater than or equal to y and less than or equal to x are x and y themselves.
also covering
(mining engineering)
The thickness of rock between the mine workings and the surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

cover

1. In reinforced concrete, the least distance between the surface of the reinforcement and the outer surface of the concrete.
2. That part of a tile or shingle which is covered by the next course.
3. The concrete (or concrete-like material) which covers steel reinforcement to protect the steel from possible fire damage or corrosion.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

cover

i. An area on the ground covered by imagery, photograph, mosaic, etc.
ii. The protection of friendly forces (ground, maritime, or air) by friendly aircraft and/or by EW (electronic warfare) aircraft.
iii. That which conceals or protects, such as darkness, a topographical feature, a bank of clouds, a shell barrage, or a deceptive move.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Tare placed Ben Hilfenhaus' first delivery through the gap between cover point and backward point for the first boundary of the match.
The 200 arrived in the 64th over but nine runs later the stand ended on 47 as Wainwright played Dimitri Mascarenhas straight into the hands of Danny Briggs at cover point.
The left-armseamer tempted Joyce into a drive straight to his big mate Dalrymple at cover point in the eighth over.
Rashid sprinted a single off the second ball and after four leg byes had levelled the scores, Gough smashed the winning boundary through cover point to finish on 20 from just nine balls with four fours and with it Lancashire further saw their grip on the Twenty20 North Group loosened.
Flower played everything on merit while Bopara, not 21 until next week, did give a hard chance to Nicky Peng at cover point on 79.
The partnership was broken an hour before lunch with Muchall square-driving Neil Dexter and being held by Key low to his left at cover point.
I also bowl medium pace and enjoy fielding at cover point.
Since he made his Warwickshire debut 12 years ago Penney has established a reputation as being one of the best outfielders in the world, a quick and athletic cover point.
Skipper Wood, no doubt preoccupied by his decision to bat, pulled Harrison to cover point and although Richard Blakey has the reputation of hanging around in difficult conditions, he lasted only three overs before being well caught by Powell at second slip to leave the hosts reeling at 46 for four.
Australian Darren Lehmann looked good for a time, moving to 28 from 60 balls with three boundaries but when he sliced Mel Betts to be caught by substitute Nicky Phillips at cover point the rot set in for Yorkshire.
With the second ball of the next over from Morne Morkel, Kolkata's in-form batsman Manish Pandey also perished, playing into the hands of Kohli at cover point for 5.