virtual

adj. being such in power or effect though not formally recognized; imaginary, hypothetical; computer simulated

n. computerized representation of an actual object (Computers)

The term virtual is a concept applied in many fields with somewhat differing connotations, and also, differing denotations. Colloquially, 'virtual' has a similar meaning to '-' or 'pseudo-' (prefixes which themselves have quite different meanings), meaning something that is almost something else, particularly when used in the adverbial form e.g., "He's virtually [almost] my boyfriend". The term recently has been defined philosophically as, that which is not real, but may display the full qualities of the real.
See more at Wikipedia.org...

Adjective
1. being actually such in almost every respect; "a practical failure"; "the once elegant temple lay in virtual ruin"
(synonym) virtual(a), practical(a)
(similar) realistic
2. being such in essence or effect though not in actual fact; "a virtual dependence on charity"; "a virtual revolution"; "virtual reality"
(synonym) virtual(a)
(similar) essential

adj. virtual, being such in power or effect though not formally recognized; computer simulated

adj. constructive; potential, virtual