perpendicularly

This term is primarily used in technical, mathematical, and architectural contexts to describe a precise geometric relationship. It carries a neutral, objective tone and is rarely used in casual conversation unless describing a specific physical orientation or a construction task.

Because it is an adverb derived from the adjective "perpendicular," it describes the manner of an action or the position of an object. It is frequently paired with the preposition "to" to indicate the reference point or surface from which the ninety-degree angle is measured.