Dictionary term
Anno Domini
Direct answer
Anno Domini is the Latin-era label meaning in the year of the Lord, used for years counted in the traditional Christian era.
Anno Domini, abbreviated AD, labels years in the traditional Christian era.
Anno Domini, abbreviated AD, labels years in the traditional Christian era.
A cycle or timeline schematic for comparing the named timekeeping concept.Quick reference
- Use when
- Use Anno Domini when reproducing or explaining sources that use Christian-era notation.
- Do not use it for
- Do not assume AD notation was used contemporaneously in every region or that its calculated epoch is a precisely documented birth date.
- Reference category
- Calendars & Timekeeping
- Related terms
- Indiction, Common Era, Calendar, Julian Date
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The story behind Anno Domini
Dionysius Exiguus developed the era in late antiquity, and its use spread gradually through medieval Europe.
Anno Domini in spiritual tradition
Spiritually, Anno Domini should be explained with historical respect rather than used to rank cultures or calendars.
Anno Domini: fact and faith, kept distinct
This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.
Anno Domini in numerology
Anno Domini is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Anno Domini matters
Understanding AD is necessary for historical chronology and for the no-year-zero transition from 1 BC to AD 1.
Where interpretation stops
Anno Domini is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Introduction to Calendars - Official overview of calendar systems, leap rules, eras, and historical calendar reform.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Also appears in
- Calendars & Timekeeping
- Aliases
- None listed
- Last updated
- 2026-07-16
Read the Christian-era label
Anno Domini in a book is one thing; Anno Domini in your own birth chart is your life. The Oracle casts your real chart and tells you what it means for your love, your work, and your year ahead, in conversation, free.
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More in Calendars & Timekeeping
- Besselian Epoch
- Epact
- Gregorian Calendar
- Julian Epoch
- Metonic Cycle
- Revised Julian Calendar
- Time Zone
Common questions
What is Anno Domini?
Anno Domini is the Latin-era label meaning in the year of the Lord, used for years counted in the traditional Christian era.
How is Anno Domini used in an almanac?
Use Anno Domini when reproducing or explaining sources that use Christian-era notation.
What should I avoid when interpreting Anno Domini?
Do not assume AD notation was used contemporaneously in every region or that its calculated epoch is a precisely documented birth date.
