Look up Appendix:Glossary of topology in Wiktionary, the free dictionary.
This is a glossary of some terms used in the branch of mathematics known as topology. Although there is no absolute distinction between different areas of topology, the focus here is on general topology. The following definitions are also fundamental to algebraic topology, differential topology and geometric topology. For a list of terms specific to algebraic topology, see Glossary of algebraic topology.
All spaces in this glossary are assumed to be topological spaces unless stated otherwise.