n an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock
n machine-readable text that is not sequential but is organized so that related items of information are connected
Let me introduce the word hypertext to mean a body of written or pictorial material interconnected in such a complex way that it could not conveniently be presented or represented on paper"--Ted Nelson
n a database management system that allows strings of text (`objects') to be processed as a complex network of nodes that are linked together in an arbitrary way