arcsecond

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noun

A unit of angle; 1/60th of an arcminute, or 1/3600th of a degree.

Similar
second of arcasarcsecsecond
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Meanings

nounarcsecond (plural arcseconds)

plural arcseconds

  1. A unit of angle; 1/60th of an arcminute, or 1/3600th of a degree.

    Synonyms: second of arc, as, arcsec

Synonyms & antonyms

nounA unit of angle; 1/60th of an arcminute, or 1/3600th of a degree.

Similar
second of arcasarcsec

More synonyms by meaning

nouna 60th part of a minute of arc

Similar
second
Broader
angular unit
Also see
secondsecond of arc

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

From arc + second.

Full word history & related roots →
Cite this entry
APA

arcsecond. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/arcsecond

MLA

“arcsecond.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/arcsecond. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “arcsecond,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/arcsecond.

Source: arcsecond on Wiktionary, CC BY-SA 4.0.