Definition of: tandem

(tan′dəm) adverb
One in front of or before another: said of two or more persons or things so arranged, and of horses harnessed in single file instead of abreast.
—noun
1. Two or more horses harnessed and driven in single file; also, such a turnout, including both horses and vehicle.
2. A bicycle with seats for two persons, one behind the other: also tandem bicycle.
3. Any arrangement of two or more persons or things placed one before another.
—adjective Consisting of or being two arranged one before another. [<L, at length (of time); used in puns in sense of “lengthwise”]