ETA is the standard abbreviation for “estimated time of arrival.” In workplace messages it is best used where the thing expected to arrive—and the time basis—are clear.
ReviewedEvidence1 sourceSectionWriting & Style
Quick answer
“ETA” means “estimated time of arrival.” Use it for an expected arrival time, and make the object or milestone clear when the context is not physical travel.
Key details
Core IssueETA means “estimated time of arrival” and communicates an expected arrival time rather than a guarantee.
Phrase Roletime-estimate shorthand
Registerbusiness and general communication
Important caveats
Estimate Boundary
Because ETA is an estimate, update it when materially changed rather than presenting it as a guaranteed time.
Scope Boundary
The core dictionary meaning concerns arrival; broader project usage should be made explicit if the thing “arriving” is a file, delivery, or result.
Further guidance
Meaning
Cambridge defines ETA as “estimated time of arrival.”
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
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