instantiate is a modern formation from instance (ultimately from Latin instantia 'a being present', from instare 'to stand near, press upon', from in- 'upon' + stare 'to stand') + the verbal suffix -iate. Morphologically, the ending is part of the etymology: the suffix is attached to the older base named in the history, producing a later English derivative. In present English, the verb sense is "to represent an abstract idea by a concrete instance; in computing, to create an object from a class", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as instance, instant, substance, and constant, and in derivatives such as instantiation. Its semantic neighborhood includes exemplify, embody, realize, and represent, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin in-, Latin stare, and Proto-Indo-European *sta-.