What does contemporaneous mean?
"Contemporaneous" is a formal adjective describing things that exist, occur, or originate during the same stretch of time. A contemporaneous document, for example, was written during the very period it describes, which makes it especially valuable to historians seeking firsthand evidence rather than later recollections. The word derives from Latin roots meaning "with time" and entered English in the seventeenth century. Although it overlaps in meaning with "contemporary" — which can also describe people or things from the same era, or simply things characteristic of the present — "contemporaneous" is narrower and more precise, and unlike "contemporary," it is rarely used to mean modern or up-to-date. It appears chiefly in scholarly, legal, and journalistic prose, often in phrases such as "contemporaneous records" or "contemporaneous with." Its tone is neutral but authoritative, signaling careful attention to chronology. For writers who need to establish that two events or sources belong to the same historical window without implying they happened at the identical instant, "contemporaneous" is the word of choice.
adjectiveExisting, occurring, or originating during the same period of time; belonging to or living in the same era.
- Existing, occurring, or originating in the same period of time as something else (e.g., contemporaneous documents).
"The historian relied on contemporaneous accounts to reconstruct the events of the siege."
"The archaeologists dated the pottery by comparing it with contemporaneous artifacts found nearby."
"Her diary offers a contemporaneous record of life in wartime London, written day by day as events unfolded."
"Contemporaneous" and "contemporary" both come from Latin roots meaning "with time" — but only one of them sounds impressive in a courtroom.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of contemporaneous
"Contemporaneous" comes from the Medieval Latin "contemporaneus", formed from Latin "com-" (together) plus "temporaneus", derived from "tempus" (time). It entered English in the early seventeenth century, alongside related coinages drawing on the same root, such as "contemporary" and "extemporaneous". Other English descendants of "tempus" include "temporary", "temporal", and the musical term "tempo".
Related word forms
How contemporaneous is actually used
A formal word found mainly in academic, historical, journalistic, and legal writing. It carries a neutral connotation but lends an air of precision and authority; it would sound stilted in casual conversation, where "at the same time" or "from that same period" would be more natural.
Easily confused with contemporaneous
"Contemporary" means existing at the same time as something else or characteristic of the present day, while "contemporaneous" more strictly means occurring during the same specific period and is used almost exclusively in formal, historical, or legal contexts.
"Simultaneous" means happening at exactly the same moment, whereas "contemporaneous" means merely existing or occurring within the same broader period of time.