(philosophy, often italicized) The first principle of existing things in pre-Socratic philosophy, initially assumed to be of water.

(astronomy) One of the moons of Jupiter.

Curved.

simple past tense and past participle of arch

plural of arching

Arch; knowing.

A diminutive of the male given names Archibald or Archie.

Abbreviation of archaic. / Abbreviation of architectural.

(uncountable) Abbreviation of archaism. / (uncountable) Abbreviation of archery. / (countable) Abbreviation of archipelago. / (countable) Abbreviation of architect.

(statistics) Initialism of autoregressive conditional heteroskedasticity