Standard Lemma guide

lookahead

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.

  • UK: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

The analysis in advance of subsequent decisions that would be made if a particular branch of an algorithm was followed.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences, software-compilation

Examples

  • Our computer chess program uses lookahead to avoid difficult endgames.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The analysis of the subsequent characters before the regular expression is matched.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Qualifier: regular expressions

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Deverbal from look ahead.