What does AD stand for?
| Full form | Anno Domini |
|---|---|
| Category | Communication & everyday language |
| Type | Abbreviation |
The abbreviation AD stands for anno Domini, Latin for in the year of the Lord. It labels years in the calendar-era system also expressed with CE, Common Era.
AD does not mean After Death. AD and CE use the same year numbering; changing the label does not move an event to a different year. For a year label, the cited style guide places AD before the year and CE after it. Calendar conversion and establishing an event's actual date are separate tasks.
Meaning in context
- Anno
- In the year, in the Latin expression.
- Domini
- Of the Lord. The phrase is an era label, not the English words After Death.
Practical examples
Preserve the year
- Before
AD 150 means 150 years after a death, so I should add another interval.
- After
AD 150 and 150 CE label the same numbered year in this era system.
The alternative label changes terminology, not the numbered year. It does not verify which historical event occurred in that year.
Keep one convention
- Before
The event occurred in AD CE 150.
- After
Use AD 150 or 150 CE, following the publication's chosen convention.
Combining two equivalent era labels creates clutter rather than extra precision. The revised examples follow the cited guide's year-label order.
Original illustrative examples, not quotations or reports of actual events.
Use AD with clarity
Does changing an AD year to a CE label change the year itself?
See all guidance
Explain the letters
Expand AD as anno Domini and keep the year attached.
AD 150: anno Domini, year 150.
Use a CE label
Keep the same year number; CE goes after it in the cited convention.
AD 150 becomes 150 CE as a label change.
Write a historical date
Use the era and date actually established by your source.
The era label does not itself establish the event's date.
This changes an AD/CE era label, not the calendar or the event date. Use the historical date established by your source; the exercise does not model BC/BCE or astronomical year numbering.
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By AcronymIndex Editorial Team · Editorial policy