Standard Lemma guide

sidereal

adj · 5 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: /saɪˈdɪə.ɹi.əl/
  • US: /saɪˈdɪɚ.i.əl/
  • US: /sɪˈdɪɚ.i.əl/
  • US: Recorded audio is listed in the source snapshot.
  • US: Recorded audio is listed in the source snapshot.

1

adj

Meaning 1

Of or relating to the stars.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Relating to a measurement of time relative to the position of the stars.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adj

Meaning 3

Relating to a measurement of time relative to the point of the vernal equinox.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adjective

Meaning 4

(of divisions of time) determined by daily motion of the stars

Definition source: Princeton WordNet 3.0

Examples

  • sidereal time

Meaning relationships

Synonyms: none provided

Antonyms: civil

5

adjective

Meaning 5

of or relating to the stars or constellations

Definition source: Princeton WordNet 3.0

Examples

  • sidereal bodies
  • the sidereal system

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From Latin sīdereus + -al (cf. Latin sīderālis), from sīdus (“star, constellation”), of unknown ultimate origin, likely a substrate language such as Pre-Greek.

Across languages

Translations

34 source translations are retained for this English entry.

  • Bulgarian: зве́зден (zvézden) — of or relating to the stars
  • Catalan: sideral — of or relating to the stars
  • Chinese Mandarin: 星的 (xīng de) — of or relating to the stars
  • Chinese Mandarin: 恆星的 /恒星的 (héngxīng de) — of or relating to the stars
  • Finnish: tähti- — of or relating to the stars
  • French: sidéral — of or relating to the stars
  • German: siderisch — of or relating to the stars
  • German: Stern- — of or relating to the stars
  • Irish: réaltach — of or relating to the stars
  • Italian: siderale — of or relating to the stars
  • Japanese: 星の (hoshi no) — of or relating to the stars
  • Japanese: 恒星の (kōsei no) — of or relating to the stars
  • Korean: 항성(恒星)의 (hangseong'ui) — of or relating to the stars
  • Korean: 별의 (byeorui) — of or relating to the stars
  • Lithuanian: žvaigždinis — of or relating to the stars
  • Polish: gwiazdowy — of or relating to the stars
  • Polish: syderyczny — of or relating to the stars
  • Polish: gwiezdny — of or relating to the stars
  • Portuguese: sideral — of or relating to the stars
  • Portuguese: sidéreo — of or relating to the stars
  • Russian: звёздный (zvjózdnyj) — of or relating to the stars
  • Spanish: sidéreo — of or relating to the stars
  • Thai: นิรายนะ — of or relating to the stars
  • Welsh: serol — of or relating to the stars
  • Bulgarian: астрономически (astronomičeski) — relating to a measurement of time relative to the position of the stars
  • Catalan: sideral — relating to a measurement of time relative to the position of the stars
  • Czech: siderický — relating to a measurement of time relative to the position of the stars
  • Finnish: sideerinen — relating to a measurement of time relative to the position of the stars
  • French: sidéral — relating to a measurement of time relative to the position of the stars
  • German: siderisch — relating to a measurement of time relative to the position of the stars
  • Irish: réaltach — relating to a measurement of time relative to the position of the stars
  • Italian: siderale — relating to a measurement of time relative to the position of the stars
  • Polish: gwiazdowy — relating to a measurement of time relative to the position of the stars
  • Thai: นิรายนะ — relating to a measurement of time relative to the position of the stars
Real reading context

sidereal in complete knowledge articles