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injection

 

  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Injection  \In*jec"tion\,  n.  [L.  injectio  :  cf.F.  injection.] 
  1.  The  act  of  injecting  or  throwing  in  --  applied 
  particularly  to  the  forcible  throwing  in  of  a  liquid,  or 
  a["e]riform  body,  by  means  of  a  syringe,  pump,  etc 
 
  2.  That  which  is  injected;  especially,  a  liquid  medicine 
  thrown  into  a  cavity  of  the  body  by  a  syringe  or  pipe;  a 
  clyster;  an  enema.  --Mayne. 
 
  3.  (Anat.) 
  a  The  act  or  process  of  filling  vessels,  cavities,  or 
  tissues  with  a  fluid  or  other  substance. 
  b  A  specimen  prepared  by  injection. 
 
  4.  (Steam  Eng.) 
  a  The  act  of  throwing  cold  water  into  a  condenser  to 
  produce  a  vacuum. 
  b  The  cold  water  thrown  into  a  condenser. 
 
  {Injection  cock},  or  {Injection  valve}  (Steam  Eng.),  the  cock 
  or  valve  through  which  cold  water  is  admitted  into  a 
  condenser. 
 
  {Injection  condenser}.  See  under  {Condenser}. 
 
  {Injection  pipe},  the  pipe  through  which  cold  water  is 
  through  into  the  condenser  of  a  steam  engine. 
 
  From  WordNet  r  1.6  [wn]: 
 
  injection 
  n  1:  the  forceful  insertion  of  a  substance  under  pressure 
  2:  any  solution  that  is  injected  (as  into  the  skin)  [syn:  {injectant}] 
  3:  the  act  of  putting  a  liquid  into  the  body  by  means  of  a 
  syringe;  "the  nurse  gave  him  a  flu  shot"  [syn:  {shot}] 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  injection 
 
  1.    A  {function},  f  :  A  ->  B,  is  injective  or 
  one-one,  or  is  an  injection,  if  and  only  if 
 
  for  all  a,b  in  A,  f(a)  =  f(b)  =>  a  =  b. 
 
  I.e.  no  two  different  inputs  give  the  same  output  (contrast 
  many-to-one).  This  is  sometimes  called  an  embedding.  Only 
  injective  functions  have  left  inverses  f'  where  f'(f(x))  =  x, 
  since  if  f  were  not  an  injection,  there  would  be  elements  of  B 
  for  which  the  value  of  f'  was  not  unique.  If  an  injective 
  function  is  also  a  {surjection}  then  is  it  a  {bijection}. 
 
  2.    An  injection  function  is  one  which  takes 
  objects  of  type  T  and  returns  objects  of  type  C(T)  where  C  is 
  some  {type  constructor}.  An  example  is 
 
  f  x  =  (x,  0). 
 
  The  opposite  of  an  injection  function  is  a  {projection} 
  function  which  extracts  a  component  of  a  constructed  object, 
  e.g. 
 
  fst  (x,y)  =  x. 
 
  We  say  that  f  injects  its  argument  into  the  data  type  and  fst 
  projects  it  out 
 
  (1995-03-14)




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