′

′

1. Feet
2. Minutes (as a fraction of a degree of arc)
3. Minutes (as a unit of time)
4. (calculus) Derivative of

   f′(x)= df(x)/dx

5. (set theory) Complement of a set
6. (in transliterated Cyrillic text) Transliteration of the soft sign (ь), indicating palatalization of preceding consonants – more correctly the modifier letter ⟨ʹ⟩.
7. (linear algebra, of a matrix) Transpose

   A′ = A^T

8. (geometry) Used to distinguish two or more points, lines, etc. with the same name

   t, t′, t″, t‴, t⁗, …

   A, A′, A″, A‴, A⁗, …

9. (phonetics) palatalization symbol in Slavic Phonetic Alphabet – more correctly the modifier letter ⟨ʹ⟩

In English, this symbol is known as prime.

• (other primes) ″, ‴, ⁗, ‵, ‶, ‷

′

1. (lexicography) marks stress.

Comes at the end of the stressed syllable, e.g. \sə‧rēn′\ for serene. May be bolded for primary stress, and used on unstressed syllables to indicate that a vowel is not reduced, e.g. \băt′‧ᵊl‧shĭp′\ for battleship.