virtually

Etymology

Definitions

1. 1

   Almost but not quite.

   • With our Medicare supplemental insurance plan, there are virtually no claim forms to fill out. (Advertisement)
2. 2

   In essence or functionally, but not in fact, formally, or technically.

   • virtually a member of the family
3. 3

   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.
   • In this paper, we are mainly concerned with homogeneity in the class of finitely generated virtually free groups, i.e. finitely generated groups with a free subgroup of finite index.
4. ›+ 2 more definitionsshow fewer

   1. 4

      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).
      • We call a hyperplane Y in a VH-complex X virtually clean if there exists a finite-sheeted covering map p : X̂ → X and a connected component Y ⊆ p⁻¹Y such that the hyperplane Ŷ of X̂ is clean.
   2. 5

      By computer or in cyberspace.

The neighborhood