The Spanish adjective 'previsional' comes from the noun 'previsión' (meaning 'foresight') combined with the adjective suffix '-al'. The word 'previsión' traces back to the Latin 'praevisio' (foresight), which was derived from the Latin verb 'praevidere' meaning 'to foresee'. This Latin verb was itself a compound formed by combining the prefix 'prae-' (meaning 'before') with the verb 'videre' (meaning 'to see').

The development of this word shows how combining 'before' and 'see' created the concept of 'foreseeing' or 'anticipating', which then evolved into terms related to planning and provision for the future.

Several common Spanish words share this etymology, including 'prever' (to foresee), 'previsto' (foreseen), and 'previsión' (foresight). All these words maintain the core meaning of seeing or anticipating something beforehand. The noun 'previsión' is particularly important as it's the direct base for 'previsional'.

English speakers might recognize the connection to words like 'vision', 'visible', and 'video', all of which come from the same Latin root 'videre' (to see). The prefix 'pre-' in English serves the same function as Latin 'prae-', appearing in words like 'preview' and 'prevision', which are very close in both meaning and form to the Spanish words. The English word 'provisional' is also directly related, showing how both languages developed similar terms from this Latin source.