The only free and comprehensive online etymological dictionary of the Spanish language
operar (Verb) "to operate"
18th cent. From Latin operari 'id.' A verb formed from opus "work" (see obra).
Indo-European
Romance
French opérer, Italian operare, Romanian opera, Sardinian oberare
opinar (Verb) "to opine"
Very late 15th cent. From Latin opinari 'id.' While it looks to be a derivation from Proto-Italic *op-eje- "to choose" (whence optar), the semblance is superficial. A putative **op-einā- only raises more problems than it solves. Of unknown origin.
Indo-European
Romance
Portuguese opinar, French opiner
opinión f. (Noun) "opinion"
13th cent. From Latin opinionem, accusative of opinio 'id.' From the verb opinari "to opine" (see opinar).
Indo-European
Romance
Portuguese opinião, French opinion, Italian opinione
oportunidad f. (Noun) "opportunity"
From Latin opportunitatem, the accusative case of opportunitas 'id.' From opportunus "opportune" (see oportuno).
Indo-European
Romance
Portuguese oportunidade, Italian opportunità
oportuno (Adjective) "opportune"
From Latin opportunus 'id.,' from ob- "toward" and portunus "suitable." Portunus is from porto "gate" (see puerto).
Indo-European
Romance
Portuguese oportuno, French opportun
-opsia (Suffix) "-opsy"
Borrowed from Ancient Greek -οψία (aytopsía) 'id.' From ὤψ (óps) "eye." From Proto-Indo-European *h3okw- "to see" (the same origin of ojo).
optar (Verb) "to opt (for)"
Very late 16th cent. From Latin optare 'id.,' from *opere "to choose" and frequentive suffix -tare (see note under faltar). Latin opere is from Proto-Italic *op-eje- 'id.' From Proto-Indo-European *h1op-ei̯e- 'id.'
Indo-European
Romance
Portuguese optar, French opter, Italian optare, Romanian optare
Italic
Oscan ufteis "of the wish," Umbrian upetu "he chose"
Indo-Iranian
Sanskrit ā́pa "has reached," Young Avestan āpa 'id.'
-or (Suffix) A noun-forming suffix denoting agency.
From Latin -or, a suffix forming abstract nouns from verbs. Often showing the condition or state of the verb. From Old Latin -os 'id.' From Proto-Italic *-ōs 'id.' From the Proto-Indo-European *-e/o-s Caland system of nominal derivation.
orar (Verb) "to pray"
12th cent. From Latin orare 'id.' According to de Vaan (2014), a verb formed from Proto-Italic *ōs- "mouth." See ósculo.
Indo-European
Romance
Portuguese orar, Galician orar, Catalan orar, Italian orare, Aromanian or, Romanian ura
Italic
Oscan urust "he will prosecute"
orden m. & f. (Noun) "order;" "warrant"
12th cent. From Latin ordinem 'id.,' the accusative case of ordo "series," "order," "social class." Despite its long and secure history in colloquial texts, this must be a learned form as ordinem should have yielded **orne. From Proto-Italic *ord-n- 'id.' From Proto-Indo-European *h2or-d- 'id.' From *h2er- "to join," "to fit" which often doubled in meaning as morally and legally appropriate (see arma).
Indo-European
Romance
Asturian orde, Portuguese ordem, Galician orde, Catalan ordre, French ordo, ordre, Italian ordine, Aromanian urdin, Romanian ordin, Sardinian oldine