The Spanish word 'otero', meaning 'hill' or 'knoll', traces its origins back to Latin. It developed from the Latin word 'altarium', meaning 'high altar' or 'elevated thing'. 'Altarium' itself comes from the Latin adjective 'altus' meaning 'high' or 'deep', which in turn derives from the Latin verb 'alere' meaning 'to nourish' or 'grow'. The semantic evolution from 'high altar' to 'hill' makes intuitive sense, as both concepts involve elevated structures or landforms.

Some related Spanish words include 'alto' (meaning 'high' or 'tall') and 'altar' (meaning 'altar'), which both share the same Latin root 'altus'. This connection helps explain why 'otero' refers to an elevated landform, as it maintains the core meaning of height or elevation from its Latin origins.

English speakers might recognize the connection to words like 'altar' and 'altitude', which also derive from Latin 'altus'. The word 'old' is also surprisingly related, coming from the same Indo-European root as 'alere' with the original sense of 'grown up' or 'nourished'. These connections show how the concept of height and growth are linked in the development of these related words across languages.