The Spanish word 'examinación' (examination) comes from the Latin word 'examinatio', which developed from the verb 'examinare' meaning 'to weigh' or 'to examine'. This verb was derived from 'examen', which was formed by combining three Latin elements: the prefix 'ex-' meaning 'out', the root 'agere' meaning 'to drive' or 'to do', and the instrumental suffix '-men'.

Originally, 'examen' referred to the tongue or pointer of a balance scale, and by extension came to mean the act of weighing or examining something carefully. This meaning evolved from the physical act of weighing objects to the more abstract concept of testing or examining knowledge or abilities, giving us the modern Spanish word 'examinación'.

Some related and more commonly used Spanish words include 'examen' (test, exam), which is actually more frequently used than 'examinación'. The verb 'examinar' (to examine, to test) is also related. These words all share the same Latin root and maintain similar meanings related to testing or careful inspection.

English speakers can easily connect 'examinación' to the English word 'examination' and its shortened form 'exam', as they share the same Latin ancestry. Other related English words include 'examine' and 'examiner'. The connection between these words is clear both in their spelling and meaning, as they all relate to the concept of careful testing or inspection.