ETA
Edited To Add — flags new material the poster bolted on after publishing.
Definitions
Notation, usually "ETA:" at the bottom of a post or comment, marking text added after the original publish — typically responding to early replies without rewriting the whole thing.
Estimated Time of Arrival — when something or someone is expected to show up. Older, broader use that predates the Reddit one.
ETA In A Sentence
Origin & Usage
Originated on parenting and craft forums in the early 2000s, widely adopted on Reddit and Tumblr as a way to clearly mark post-publication additions.
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