epact: meaning, definition, pronunciation and examples
C2Formal, Technical (historical, calendrical, ecclesiastical)
Quick answer
What does “epact” mean?
The number of days by which the solar year exceeds the lunar year.
Audio
Pronunciation
Definition
Meaning and Definition
The number of days by which the solar year exceeds the lunar year.
In calendrical calculation, the age of the moon in days on 1 January of the solar year, used to compute the date of Easter.
Dialectal Variation
British vs American Usage
Differences
No differences in meaning or usage. It is a technical term used identically in both dialects.
Connotations
Historical, academic, or religious (specifically Christian) scholarship.
Frequency
Extremely rare in general usage in both regions. Its use is confined to specific historical or liturgical texts and discussions.
Grammar
How to Use “epact” in a Sentence
The epact (for a given year) is...to calculate the epactan epact of XVocabulary
Collocations
Examples
Examples of “epact” in a Sentence
adjective
British English
- The epact value was crucial for the computus.
American English
- The epact calculation was meticulously documented.
Usage
Meaning in Context
Business
Not used.
Academic
Used in historical, astronomical, or religious studies papers discussing calendars.
Everyday
Virtually never used.
Technical
Used in precise discussions of historical calendrical systems (e.g., the Gregorian calendar reform).
Vocabulary
Synonyms of “epact”
Strong
Weak
Watch out
Common Mistakes When Using “epact”
- Using it as a verb (e.g., 'to epact').
- Confusing it with 'impact'.
- Assuming it has a meaning outside its specific technical domain.
FAQ
Frequently Asked Questions
No, it is an extremely rare and specialised term, almost exclusively found in historical texts about calendars or ecclesiastical calculations.
No, 'epact' is only used as a noun. There is no standard verb form.
No, it is an identical technical term in both dialects.
Primarily in history of science, historical astronomy, religious studies (specifically Christian liturgy), and the history of timekeeping and calendars.
The number of days by which the solar year exceeds the lunar year.
Epact is usually formal, technical (historical, calendrical, ecclesiastical) in register.
Epact: in British English it is pronounced /ˈiːpakt/, and in American English it is pronounced /ˈiˌpækt/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: EPACT = Excess Period, A Calendar Term. It's the extra days the sun has on the moon at the year's start.
Conceptual Metaphor
TIME AS A MEASURABLE GAP (the epact is the 'gap' or 'overlap' between two cyclic time systems).
Practice
Quiz
What is an 'epact' primarily used for?