The Spanish word 'tango' traces its roots to the Latin word 'tangere', meaning 'to touch'. This connection makes sense given that tango is a partner dance characterized by close contact between dancers. The word likely comes more specifically from the Latin first-person present form 'tango' meaning 'I touch'.

While the exact etymology is debated by some scholars, this Latin origin theory is supported by the intimate nature of the dance, which emerged in the late 19th century in the Rio de la Plata region between Argentina and Uruguay.

A related Spanish word is 'tañer', which means 'to play (a musical instrument)'. This verb also comes from Latin 'tangere', as playing an instrument involves touching or striking the strings or keys. While 'tañer' is somewhat archaic in modern Spanish, it shows how the concept of 'touching' evolved into different but related meanings in Spanish.

Several English words share the same Latin root 'tangere'. Some common examples include 'tangible' (something that can be touched or is physical), 'tangent' (a line that touches a curve at a single point), and 'intact' (from 'in' + 'tactus', meaning untouched or whole). The concept of touching is preserved in all these related words, though each has developed its own specific meaning.