The Spanish verb 'librar' meaning 'to free' or 'to deliver' comes from the Latin verb 'liberare', which meant 'to free'. The Latin 'liberare' itself was formed from the Latin adjective 'liber' meaning 'free' combined with the verbal suffix '-are'. Over time, as Latin evolved into Spanish, 'liberare' underwent phonetic changes, dropping the middle 'e' and simplifying to become 'librar'.

Several common Spanish words share this Latin root, including 'libre' (free), 'libertad' (freedom), and 'liberación' (liberation). These words all maintain the core meaning of freedom or release from their Latin ancestor.

English speakers can connect 'librar' to many familiar English words that come from the same Latin root, such as 'liberty', 'liberal', 'liberate', and 'deliver'. All these words retain some connection to the original concept of freedom or release. For example, to 'liberate' is to set free, while to 'deliver' (which came through French) originally meant to 'set free' or 'release' and later evolved to mean 'to hand over' or 'to bring'.