Meaning of TANDEM in English

TANDEM

tan ‧ dem /ˈtændəm/ BrE AmE noun [countable]

[ Date: 1700-1800 ; Language: Latin ; Origin: 'finally, at length' (taken to mean "lengthwise", and so used for vehicles with one horse or person in front of another) ]

1 . a bicycle built for two riders sitting one behind the other

2 . in tandem doing something together or at the same time as someone or something else:

The two companies often work in tandem.

in tandem with

The group operated in tandem with local criminals.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.