ad inf.

Writing & Everyday abbreviation · Latin

ad inf.
Stands forAd infinitum (to infinity)
CategoriesWriting & Everyday

ad inf. stands for Ad infinitum (to infinity), a Latin abbreviation.

Describes something that continues endlessly or repeats without limit. Mathematicians use it for infinite sequences, and general writers use it for processes that seem never-ending.

Example: The series 1 + 1/2 + 1/4 + 1/8 and so on ad inf. adds up to exactly 2.

Usage notes

The abbreviation is uncommon; the full phrase ad infinitum is far more frequent in English prose. It is often confused with ad nauseam, "to the point of nausea," which adds a sense of tedium. Philosophers describe an infinite regress as one that continues ad infinitum. Pronounced "ad in-fih-NYE-tum."

More Latin abbreviations

  • a.m. – Ante meridiem (before midday)
  • a.u.c. – Ab urbe condita (from the founding of the city)
  • AD – Anno Domini (in the year of the Lord)
  • ad lib. – Ad libitum (at one's pleasure)
  • aet. – Aetatis (aged, at the age of)
  • c. – Circa (around, approximately)
  • cet. par. – Ceteris paribus (other things being equal)
  • cf. – Confer (compare)
  • CV – Curriculum vitae (course of life)
  • d. – Denarius (penny)
  • D.G. – Dei gratia (by the grace of God)
  • D.V. – Deo volente (God willing)

See all 53 Latin abbreviations →