The only free and comprehensive online etymological dictionary of the Spanish language
acabose m. (Noun) "end"
13th cent. Formed by treating the verb acabose "it is completed" as a noun. See acabar.
acaso m. (Adverb, Noun) "maybe;" "chance"
15th cent. From a- and caso.
Asturian acasu, Portuguese acaso
acceder (Verb) "to accede"
18th cent. borrowing from Latin accedere "to approach." From ad- "toward" (see a(d)-) and cedere "to move," but more commonly "to yield" (see ceder).
acceso m. (Noun) "access"
15th cent. Borrowed from Latin accessus 'id.' From accedere "to advance upon" (see acceder).
accesoria f. (Noun) "outbuilding"
From acceso and -orio.
accesorio (Adjective, Noun) "accessory"
15th cent. From acceso and -orio.
accidente m. (Noun) "accident"
14th cent. From Latin accidentem, accusative of accidens 'id.,' a noun from the verb accidere "to happen," "to befall." From ad- "toward" (see a(d)-) and cadere "to fall" (see caer).
The original sense of "to happen" is better preserved in the phrase por accidente "by chance," "coincidentally," and when used to describe the Christian eucharist (e.g. los accidentes del pan y vino "the qualities of the bread and wine").
Old French accident
acción f. (Noun) "action"
Late 15th cent. From Latin actionem, accusative of actio 'id.' From Proto-Italic *ak-ti- 'id.,' derived from *ag-e/o- "to act" (see -igar).
Asturian aición, Portuguese ação, Catalan acció, French action, Italian azione, Romanian acțiune
Umbrian ahti-
accionado m. (Noun) "shareholding"
From acción.
accionar (Verb) "to drive (a machine)"
18th cent. From acción.