n. The power or capacity of enduring; the act of enduring; endurance.n. The endurance of the presence or actions of objectionable persons, or of the expression of offensive opinions; toleration.n. The power possessed or acquired by some persons of bearing doses of medicine which in ordinary cases would prove injurious or fatal.n. Capability of growth in more or less shade.n. the allowed amount of variation from the standard or from exact conformity to the specified dimensions, weight, hardness, voltage etc., in various mechanical or electrical devices or operations; -- caklled also allowancen. the capacity to resist the deleterious action of a chemical agent normally harmful to the organism.n. the acquired inability to respond with an immune reaction to an antigen to which the organism normally responds; -- called also immunotolerance, immunological tolerance, or immune tolerance. Such tolerance may be induced by exposing an animal to the antigen at a very early stage of life, prior to maturation of the immune system, or, in adults, by exposing the animal to repeated low doses of a weak protein antigen (low-zone tolerance), or to a large amount of an antigen (high-zone tolerance).