pre-emption (iou) and Allergy (medicine)

pre-emption (iou)

pre-emption noun. E17.
[medieval Latin praeemptio(n-), from praeempt- pa. ppl stem of praeemere, from prae PRE- + emere buy: see -ION.]
The purchase by one person or party before an opportunity is offered to others; the right to make such purchase; Hist. the prerogative of the monarch to buy household provisions in preference to Other people and at special rates. E17.
N. Hawthorne The papal government..has the right of pre-emption whenever any relics of ancient Art are discovered.
b. N. Amer. & Australian History. The preferential purchase, or right of purchase, of public land by an occupant, on condition of his or her improving it; a piece of land so obtained M18.
c. International Law. The right of a belligerent to seize goods of neutrals which are considered doubtfully or conditionally contraband. M19.
Bridge. The action of making a pre-emptive bid. M20.
The action or an act of setting aside or overriding something. L20.
Military. The action or strategy of making a pre-emptive attack. L20.
pre-emptioner noun a person with a prior right to buy certain public land M19.

Allergy (medicine)

allergy

1. <immunology> A state of hypersensitivity induced by exposure to a particular antigen (allergen) resulting in harmful immunologic reactions on subsequent exposures, the term is usually used to refer to hypersensitivity to an environmental antigen (atopic allergy or contact dermatitis) or to drug allergy.

The original meaning, now obsolete, included all states of altered immunologic reactivity, immunity as well as hypersensitivity. Gell and Coombs used the term allergic reaction to mean any harmful immunologic reaction causing tissue injury.

2. <study> The medical specialty dealing with diagnosis and treatment of allergic disorders.

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