aciua.

Unknown. Often considered to derive from a hypothetical Vulgar Latin root *accubilare, but this does not work on a phonetic basis. Most likely derived from Latin cieō, ciere (“put in motion, act; summon, call”) or acciō, accīre (“summon, call for, fetch”), with a later change in conjugation. It was probably originally a word applied to the pastoral lifestyle, and referred to calling animals to round them up to find shelter, such as in the case of bad weather. The shift from -i- to -iu- can also be found in several other Latin-derived Romanian words, such as bucium. Other theories for this etymology are less likely, such as a Vulgar Latin *accellare, from cella, or from *jacila, or a Slavic utečati (which is highly unlikely since it's not a fourth-conjugation verb).