The word "transgression" originates from Latin transgressio, which itself is derived from the verb transgredi, meaning "to step across." This verb is a compound of trans- ("across") and gradi ("to step, go"). The literal sense was of physically crossing a boundary, such as a river or a territorial line. Over time, this concrete image of crossing a line was metaphorically extended to the abstract realm of law and morality, where it signifies the act of overstepping prescribed limits. The suffix -ion was added to form a noun describing the action or result of this boundary-crossing, solidifying its modern meaning as a violation.

Structure: trans (across) + gress (step, go) + ion (action or state) - trans: Latin origin, meaning "across, beyond, through." A prefix indicating movement or change from one state or place to another. - gress: Latin origin, from the root of the verb gradi meaning "to step, to go." It functions as the core root indicating motion. - ion: Latin suffix via French, indicating an action, process, or its result. It forms abstract nouns from verbs.