virtually

adverb5

1. •
   Almost but not quite.

   • With our Medicare supplemental insurance plan, there are virtually no claim forms to fill out. (Advertisement)
2. •
   By computer or in cyberspace.
3. •
   In essence or functionally, but not in fact, formally, or technically.
4. •
   Of a subgroup of finite index.

   • In this case W has a diagram with 2 vertices and one edge labelled ∞, and is therefore the infinite dihedral group. Thus W is virtually ℤ. — 1998
5. •
   Of a covering space of finite degree.

   • Another class of small manifolds consists of those that are not virtually Haken (a manifold is virtually Haken if it is finitely covered by a Haken manifold). — 2002