The Spanish word 'nexo', meaning 'link' or 'connection', comes from the Latin word 'nexus', which meant 'bond, tie, or connection'. This Latin noun itself was derived from the verb 'nectere', meaning 'to bind' or 'tie'. The evolution from the Latin terms to modern Spanish maintained both the form and core meaning of connection or binding, showing how stable this concept has remained across time.

A related Spanish word is 'conexión' (connection), which shares the same Latin root. Another related term is 'anexo' (annex or appendix), which also comes from the idea of binding or attaching something to something else.

English speakers might recognize this word's connection to 'nexus', which is used in English to mean a connection or link, especially an important central connection. The word 'connect' itself is also related, coming from the same Latin root 'nectere'. Even the word 'annex' shares this ancestry, all carrying the core meaning of joining or binding things together.