Definitions
1.verbTo keep delaying; to continue to hinder; to prevent from progress"retard the march of an army"
2.verbTo put off; to postpone."to retard a rupture between nations"
3.verbTo be slow or dilatory to perform (something).
4.verbTo decelerate; to slow down.
5.verbTo stay back.
6.adjectiveDelayed; delayed in development, hindered; impeded.
7.adjectiveHaving mental retardation; mentally deficient or underdeveloped.
8.adjectiveSpecifically, having an IQ below 70.
9.adjectiveExtremely stupid.
10.adjectiveDesignating a parameter of an electromagnetic field which is adjusted to account for the finite speed of radiation.