Usage Note
Posteriormente is a formal adverb meaning 'later on' or 'afterwards', used in written and academic registers. It is interchangeable with más tarde or después in less formal contexts. Because it is long and formal, it rarely appears in casual speech — hearing it is a cue that the speaker or text is in a formal register.
Examples
"El acuerdo fue firmado posteriormente."
Natural Translation
The agreement was signed subsequently.

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