›[U]the ability to deal with something unpleasant or annoying, or to continue existing despite bad or difficult conditions: My tolerance of heat is considerably greater after having lived in the Far East for a couple of years.Tolerating and enduringCoping and not copingDealing with things or people›[U]specializedan animal's or plant's ability not to be harmed by a drug or poison over a long period of time: a greater tolerance of/to the drugImmunology and vaccination