tandem

The term describes a linear arrangement where elements follow one another in a sequence. When used as an adjective, it specifically contrasts with side-by-side configurations, often appearing in technical contexts like aviation or specialized seating.

In its adverbial form, typically used in the phrase "in tandem," the meaning shifts from physical alignment to temporal or functional synchronization. It implies a coordinated effort where two entities work together simultaneously to achieve a common goal, suggesting a symbiotic relationship rather than just a physical line.