The only free and comprehensive online etymological dictionary of the Spanish language
célere (Adjective) "fast"
Borrowed sometime before the 15th cent. from Latin celerem, accusative of celer "swift." From Proto-Italic *keli-ri- 'id.' A dissimilation of *keli-li-, from Proto-Indo-European *kel-i̯- "speeding" and suffix *-li̯- (see -al (2)).
Indo-European
Germanic
Gothic haldan "to feed," Old Norse halda "to hold," Old Saxon haldan 'id.,' Old High German haltan 'id.,' Old English healdan 'id.' (English to hold)
Hellenic
Ancient Greek κέλλειν (kéllein) "to drive on," "to harbor"
Indo-Iranian
Sanskrit kaláyati
cena f. (Noun) "dinner"
12th cent. From Latin cena 'id.' From Proto-Italic *kertsnā "meal." From Proto-Indo-European *(s)kert-s-n̥h2- "portion." The root *kert- is of unclear meaning; possibly meaning "piece" and hence connected to *(s)k(e)rH- "piece of meat," in which case see carne.
Indo-European
Romance
Asturian cena, Portuguese ceia, Galician cea, Catalan la Cena "name for the Last Supper in Christianity," French cène, Romansh tschaina, Italian cena, Dalmatian caina, Aromanian tsinã, Romanian cină, Sardinian chena
Italic
Oscan kersnu, Umbrian śesna
Balto-Slavic
Lithuanian kérti "to cut," skìrti "divide"
Hellenic
Ancient Greek κείρειν (keírein) "to cut"
Armenian
Armenian k'ert'em "to skin"
Indo-Iranian
Sanskrit kr̥ntáti "to cut"
The cognates in Romansh and Eastern Romance languages point to yod-variant Vulgar Latin *ceina formed by vowel-breaking the e, but other languages point directly to cena. Spanish does not hint either way.
In the Gallo-Romance, the word was restricted to religious senses and other words were used in its place (French dîner, Catalan sopar).
cenar (Verb) "dinner"
12th cent. From Latin cenare 'id.,' from Latin cena "dinner." See cena.
Indo-European
Romance
Asturian cenar, Portuguese cear, Galician cear, Italian cenare, Aromanian tsinari, Romanian cinare, Sardinian chenare
ceñir (Verb) "to gird"
12th cent. From Latin cingere "to gird," but also "to surround." As de Vaan (2014) speculates, possibly from Proto-Italic *keng- "to gird." Of unknown origin.
Indo-European
Romance
Asturian ciñir, Portuguese cingir, French ceindre, Italian cingere, Aromanian tsingu, Romanian cinge, Sardinian chingere
censar (Verb) "to document for a census"
From census.
censatorio (Adjective, Noun) "leasing;" "lessor"
Early 17th cent. From censo.
censido (Adjective) "taxed (by a census)"
From censo.
censista (Noun) "census worker"
From censo.
censo m. (Noun) "census;" "lease"
12th cent. From Latin census "census," "register," "wealth;" from censere "to opine," "to judge," "to decree." From Proto-Italic *kensē- "to estimate." From Proto-Indo-European *ḱn̥s-eh1- "to announce."
Indo-European
Romance
Asturian censu, Portuguese censo, French cens, Italian censo, Romanian cens
Indo-Iranian
Sanskrit śaṃsati "declares"
censor (Adjective, Noun) "censoring;" "censor"
15th cent. From Latin censor 'id.,' from census "census," "register" (see census).
Indo-European
Romance
Portuguese censor, Catalan censor, French censeur, Italian censore, Romanian cenzor