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)).
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)
Ancient Greek κέλλειν (kéllein) "to drive on," "to harbor"