pl. n.
  - 
[treated as sing. or pl.]
 an action or system by which a result is achieved.
 - financial resources; income. 
▸substantial resources; wealth.
 
 
  Phrase
  
    - by all means
 of course.  - by any means
 
[with neg.]
 at all.  - by means of
 by using.  - by no means 
(or by no manner of means)
 certainly not.
  - a means to an end
 a thing that is not valued in itself but is useful in achieving an aim. 
   
  Etymology
  ME: pl. of mean3, the early sense being ‘intermediary’.