Phrase guide

beta reduction

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ˈbeɪ.tə.ɹɪˌdʌk.ʃən/
  • /ˈbeɪ.tə.ɹəˌdʌk.ʃən/ weak vowel merger
  • US: Recorded audio is listed in the source snapshot.
  • /ˈbiː.tə.ɹɪˌdʌk.ʃən/
  • /ˈbiː.tə.ɹəˌdʌk.ʃən/ weak vowel merger

1

noun

Meaning 1

The act of beta reducing, an instance of replacing a function call by the result of calling a function.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

One of the three rewrite rules of the lambda calculus, which states that the application of a lambda abstraction (λx.t) to a term s yields an expression t[s/x], "t with s instead of x", where all free instances of x in t have been replaced by s.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: computing, computing-theory, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

No etymology was provided for this word.