Pre vs. Post
The prefixes “pre-” and “post-” point in opposite time or sequence directions: pre- means before, while post- means after. The exact spelling of a prefixed word can depend on the established word or style, so the meaning contrast does not by itself decide whether a hyphen is used.
Use “pre-” for before and “post-” for after. Check the established spelling of the complete word rather than assuming every pre-/post- formation is hyphenated the same way.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| before a named event, stage, or period | pre- | Use the before-prefix. |
| after a named event, stage, or period | post- | Use the after-prefix. |
| spelling of the complete prefixed word | verify established spelling/style | The meaning contrast does not by itself decide closed versus hyphenated spelling. |
Quick tests
Meaning / construction test
Does the prefixed term mean “before” the base event, stage, or period?
If yes: Use “pre-.”
If no: If it means “after,” use “post-”; then verify the established spelling of the complete term.
Caveat: The semantic choice is stable—pre- means before and post- means after—but the final written form of a particular prefixed word can be closed or hyphenated according to established usage and style.
Examples
A pre-event briefing happens before the event.
The prefix “pre-” supplies the before sense.
A post-event review happens after the event.
The prefix “post-” supplies the after sense.
Check the dictionary or house style for the final prefixed spelling.
Prefix meaning alone does not settle every hyphenation choice.
Further guidance
Choice Test
Choose the prefix from the time/sequence relationship first, then verify the spelling of the complete term.
Hyphen Boundary
The semantic contrast is stable, but the written form of a particular prefixed word can be closed or hyphenated according to established usage and style.
Meaning
“Pre-” forms words with a before sense; “post-” forms words with an after sense.
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.
- Prefixes — English Grammar Today (opens in a new tab)Cambridge Dictionary · Grammar reference for prefixes including pre- meaning before and post- meaning after.