Coterminus

Part of speech: adjective

Definitions

1. Having a common boundary or limit with something else; being in agreement or having a shared period with; relating to two entities that correspond in some way regarding their extent or duration
2. Marked by shared borders or endpoints; existing simultaneously or in unison within a specified timeframe; describing two items that are aligned or connect in their range or scope
3. Characterized by mutual borders or limits; occurring during the same period or alongside one another; pertaining to different concepts that intersect or relate to each other in their dimensions or timelines

Etymology: "Coterminous" comes from medieval Latin "conterminus," built from the prefix "con-" (together) and "terminus" (boundary, end-point), so the sense is literally "having the same boundary." The Latin "terminus" itself meant a boundary marker or limit, and the god Terminus was the Roman protector of such markers, which is why field boundaries were considered sacred. English took the word in the early 1600s, and it was first used mainly in a geographical sense, describing countries, estates, or districts that share a border. Over time it broadened to describe anything that covers the same extent, such as two organisations whose areas of responsibility match exactly or two periods of time that run for the same length.

Synonyms: coextensive, coinciding, conterminous, adjacent

Antonyms: separate, different, distinct