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1. Dictionary

   check

   /tʃɛk/

   verb

   • 1. examine (something) in order to determine its accuracy, quality, or condition, or to detect the presence of something: "customs officers have the right to check all luggage" Similar examineinspectlook atlook overscrutinizescansurveystudyinvestigateresearchprobedissectexplorelook intoinquire intogo intogo over with a fine-tooth combcheck outtestmonitorreviewinformal:give something a/the once-overgive something a look-seegive something a going-over
   • ▪ verify or establish to one's satisfaction: "phone us to check the availability of your chosen holiday" Similar make sureconfirmverifycorroboratevalidatesubstantiate
   • ▪ verify the accuracy of something by comparing it with (something else): "keep your receipt to check against your statement"
   • ▪ inspect or examine thoroughly: "I checked through my notes"
   • ▪ agree or correspond when compared.
   • ▪ look at; take notice of: informal "check the remix"
   • 2. stop or slow the progress of (something, typically something undesirable): "efforts were made to check the disease" Similar haltstoparrestbring to a standstillcut shortbarobstructhamperimpedeinhibitfrustratefoilthwartstand in the way ofpreventcurbblockstallhold upinterfere withretarddelayslow downbrakeput a brake onstemstauncharchaic:stay
   • ▪ curb or control (one's feelings or reaction): "he learned to check his excitement" Similar suppressrepressrestraincontaincontrolcurbrein inbridlesmothermufflestiflekeep in checkhold backswallowchoke backfight backbite backbottle upinformal:nip in the budkeep a lid onOpposite release
   • ▪ hamper or neutralize (an opponent) with one's body or stick.
   • ▪ provide a means of preventing: "processes to check against deterioration in the quality of the data held"
   • 3. (of a passenger) consign (baggage) to the care of the transport provider with whom they are travelling: North American "I checked my bag and got my boarding pass"
   • ▪ deposit (a coat, bag, or other item) for temporary safekeeping in the cloakroom of a restaurant, theatre, etc.: "the drinks weren't expensive and there's no cover charge but you do have to check your coat for $3.00"
   • 4. mark or click on (a box) in order to select a particular option on a form, questionnaire, etc.: "users who want privacy should check the box that prevents your files from being shared"
   • 5. move a piece or pawn to a square where it attacks (the opposing king): "he moves his knight to check my king again"
   • 6. (in poker) choose not to make a bet when called upon, allowing another player to do so instead.
   • 7. (of a hound) pause to make sure of or regain a scent.
   • ▪ (of a trained hawk) abandon the intended quarry and fly after other prey.

   noun

   • 1. an examination to test or ascertain accuracy, quality, or satisfactory condition: "a campaign calling for regular checks on gas appliances" Similar examinationinspectionscrutinyscrutinizationcheck-upperusalstudyinvestigationprobedissectionanalysisassessmentinquirytesttrialassaymonitoringinformal:once-overgoing-overlook-seerare:anatomization
   • 2. a stopping or slowing of progress: "there was no check to the expansion of the market"
   • ▪ a means of control or restraint: "a permanent check upon the growth or abuse of central authority" Similar controlrestraintconstraintbreakbridlecurbdeterrenthindranceimpedimentobstructioninhibitionlimitation
   • ▪ an act of hampering or neutralizing an opponent with one's body or stick.
   • ▪ a temporary loss of the scent in hunting.
   • ▪ the movement made by a hawk when it abandons its intended quarry and pursues other prey.
   • 3. a move by which a piece or pawn directly attacks the opponent's king and by which the king may be checkmated.
   • 4. US spelling of cheque
   • ▪ the bill in a restaurant: North American "let's get the check" Similar billaccountinvoicestatementlist of chargestallyamount dueinformal:the damagetabinformal, dated:shotarchaic:reckoningscore
   • 5. a token of identification for left luggage.
   • 6. a counter used as a stake in a gambling game.
   • 7. another term for tick North American
   • 8. a part of a piano which catches the hammer and prevents it retouching the strings.
   • 9. a crack or flaw in timber.

   exclamation

   • 1. expressing assent or agreement. informal North American
   • 2. used by a chess player to announce that the opponent's king has been placed in check.

   Word Origin Middle English (originally as used in the game of chess): the noun and exclamation from Old French eschec, from medieval Latin scaccus, via Arabic from Persian šāh ‘king’; the verb from Old French eschequier ‘play chess, put in check’. The sense ‘stop or control’ arose from the use in chess, and led (in the late 17th century) to ‘examine the accuracy of’.

   Derivatives

   • 1. checkable adjective

   Scrabble Points: 16

   • C

     3

   • H

     4

   • E

     1

   • C

     3

   • K

     5

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   More definitions, origin and scrabble points

2. stackoverflow.com › questions › 3781520How to test if preprocessor symbol is #define'd but has no value?

   stackoverflow.com › questions › 3781520

   I want to make sure that the project fails to compile if user forgot to define this string. While i'd check this in a previous build-step, you can do this at compile-time. Using Boost for brevity: #define A "a" #define B BOOST_STATIC_ASSERT(sizeof(BOOST_STRINGIZE(A)) > 1); // succeeds BOOST_STATIC_ASSERT(sizeof(BOOST_STRINGIZE(B)) > 1); // fails

3. stackoverflow.com › questions › 17160755Is there a way to both check a macro is defined and it equals a...

   stackoverflow.com › questions › 17160755

   Jun 18, 2013 · Learn how to use macro conditions in C programming with examples and explanations from other Stack Overflow users.

4. stackoverflow.com › questions › 1592565Determine if variable is defined in Python - Stack Overflow

   stackoverflow.com › questions › 1592565

   Mar 31, 2013 · 6. For this particular case it's better to do a = None instead of del a. This will decrement reference count to object a was (if any) assigned to and won't fail when a is not defined. Note, that del statement doesn't call destructor of an object directly, but unbind it from variable.

5. stackoverflow.com › questions › 3601515shell - How to check if a variable is set in Bash - Stack...

   stackoverflow.com › questions › 3601515

   Aug 30, 2010 · To test if a variable var is set: [ ${var+x} ]. To test if a variable is set by name: [ ${!name+x} ]. To test if a positional parameter is set: [ ${N+x} ], where N is actually an integer. This answer is almost similar to Lionel’s but explore a more minimalist take by omitting the -z. To test if a named variable is set:

6. stackoverflow.com › questions › 142508How do I check OS with a preprocessor directive?

   stackoverflow.com › questions › 142508

   Sep 27, 2008 · 2. Use #define OSsymbol and #ifdef OSsymbol where OSsymbol is a #define 'able symbol identifying your target OS. Typically you would include a central header file defining the selected OS symbol and use OS-specific include and library directories to compile and build.

7. stackoverflow.com › questions › 5113374JavaScript check if variable exists (is defined/initialized)

   stackoverflow.com › questions › 5113374

   Feb 6, 2009 · How to check if a variable exists. This is a pretty bulletproof solution for testing if a variable exists and has been initialized : var setOrNot = typeof variable !== typeof undefined; It is most commonly used in combination with a ternary operator to set a default in case a certain variable has not been initialized :

8. stackoverflow.com › questions › 8666378Detect Windows or Linux in C, C++ - Stack Overflow

   stackoverflow.com › questions › 8666378

   Dec 29, 2011 · 1. @xmoex The gist is that it lists several dozen various flags used by this or that or the other OS and this or that or the other compiler, and these 3 above appear to be the best in terms of overlap for determining Windows vs. Linux.

9. stackoverflow.com › questions › 750298Easy way to check that a variable is defined in python?

   stackoverflow.com › questions › 750298

   Jul 17, 2014 · Is there any way to check if a variable (class member or standalone) with specified name is defined? Example: if "myVar" in myObject.__dict__ : # not an easy way print myObject.myVar else print "not defined"

10. stackoverflow.com › questions › 30191521Check if a variable is undefined in PHP - Stack Overflow

    stackoverflow.com › questions › 30191521

    To check if a variable is undefined you will have to check if the variable is in the list of defined variables, using get_defined_vars(). There is no equivalent to JavaScript's undefined (which is what was shown in the question, no jQuery being used there). In the following example it will work the same way as JavaScript's undefined check.

11. stackoverflow.com › questions › 843277python - How do I check if a variable exists? - Stack Overflow

    stackoverflow.com › questions › 843277

    May 9, 2009 · exists("variable_name") Will return True or False. To check if a variable exists in the local scope in Python, you can use the locals() function, which returns a dictionary containing all local variables. You can modify your exists function to check both global and local scopes like this: def exists(var):