The Spanish verb 'ingresar' (meaning 'to enter' or 'to admit') comes from the Latin word 'ingressus' meaning 'entrance' or 'going in'. This Latin word was formed by combining two parts: the prefix 'in-' meaning 'into, inward' and 'gressus' meaning 'step' or 'walk'. The Spanish noun 'ingreso' developed directly from Latin 'ingressus', and then the verb 'ingresar' was formed by adding the Spanish infinitive suffix '-ar'.

You can think of 'ingresar' literally as meaning 'to step into' or 'to walk into' based on its Latin roots, which makes its modern meaning of 'entering' or 'being admitted' quite logical.

Some related Spanish words include 'progreso' (progress), 'regreso' (return), and 'congreso' (congress). All these words share the Latin root 'gressus' meaning 'step/walk'. 'Progreso' refers to stepping forward, 'regreso' means stepping back or returning, and 'congreso' literally means 'stepping together', which evolved to mean a formal meeting or assembly.

Many English words share the same Latin roots as 'ingresar'. The word 'ingress' means 'entrance' or 'the act of entering' and comes directly from the same Latin 'ingressus'. Other related English words include 'progress', 'regress', 'congress', and 'aggressive', all containing the Latin root meaning 'to step/walk'. The word 'gradient' (slope) is also related, referring to the degree of stepping up or down.