The Spanish verb 'partir' comes from the Latin verb 'partiri', meaning 'to divide or share'. 'Partiri' itself was derived from the Latin noun 'pars' meaning 'part'. The meaning evolved from the basic concept of dividing something into parts to also include the sense of 'to depart' or 'to leave' in Spanish - you can think of departing as dividing or separating yourself from a place or group.

Several common Spanish words share this Latin root, including 'parte' (part), 'partida' (departure), and 'repartir' (to distribute). All these words maintain the core concept of division or separation that comes from the original Latin 'pars'.

Many English words are related to 'partir' through the same Latin root 'pars', including 'part', 'partition', 'partner', and 'depart'. 'Part' directly reflects the original Latin meaning, while 'depart' parallels the Spanish 'partir' in developing the meaning of leaving or going away. A 'partition' is something that divides space, and a 'partner' was originally someone who takes part in something with you - literally someone who shares or divides something with you.