noun (plural same)
- a set of games played between two teams, or among any number of individual competitors:a playoff series against PortlandSee also World Series.
- 3 [as modifier] denoting electrical circuits or components arranged so that the current passes through each successively. The opposite of parallel.
- 4 Musicanother term for tone row.
- 6 Chemistry a set of elements with common properties or of compounds related in composition or structure:the metals of the lanthanide seriesCompare with period (sense 5 of the noun).
early 17th century: from Latin, literally 'row, chain', from serere 'join, connect'