1. [ noun ] a decrease in speed
Synonyms: slowing deceleration

"the deceleration of the arms race"

Related terms: acceleration speed decelerate retard decelerate
2. [ noun ] any agent that retards or delays or hinders
Synonyms: retardent retardant


Related terms: agent retard
3. [ noun ] (psychology) lack of normal development of intellectual capacities
Synonyms: backwardness slowness subnormality mental_retardation
Related terms: stupidity idiocy abnormality imbecility mongolism moronity check
4. [ noun ] the extent to which something is delayed or held back
Related terms: delay retard
5. [ noun ] the act of slowing down or falling behind
Synonyms: lag slowdown
Related terms: delay decelerate slow retard decelerate
Similar spelling:   reiteration