n.
 (pl. same)
      - a number of similar or related things coming one after another. ▸a set of books, periodicals, etc., published in a common format. ▸a set of stamps, banknotes, or coins issued at a particular time. 
- a sequence of related television or radio programmes.
- Music  another term for tone row.
- 
[as modifier]
 having or denoting electrical components connected in series.
- Geology  a range of strata corresponding to an epoch in time, being a subdivision of a system and itself subdivided into stages.
- Mathematics  a set of quantities constituting a progression or having values determined by a common relation.
Phrase
  
    
      - in series
 (of electrical components or circuits) arranged so that the current passes through each successively.
 
  Etymology
  C17: from L., lit. ‘row, chain’, from serere ‘join’.