n.
 
[
treated as sing. or pl.]
      
- a number of people or things located, gathered, or classed together.
 - a number of musicians who play popular music together.
 - Chemistry  a set of elements occupying a column in the periodic table and having broadly similar properties.
 - Chemistry  a combination of atoms having a recognizable identity in a number of compounds.
 - Mathematics  a set of elements, together with an associative binary operation, which contains an inverse for each element and an identity element.
 - a division of an air force, usually consisting of two or more stations.
 
v.
 place in or form a group or groups.
 
  Derivative
  
  Etymology
  C17: from Fr. groupe, from Ital. gruppo, of Gmc origin; rel. to crop.