'liberable' originates from Latin, specifically the word 'liberare', where 'liber-' meant 'free' and the suffix '-able' comes from Old French/Latin 'abilis' meaning 'capable of'.

'liberable' changed from Latin 'liberare' (to free) through Old French forms such as 'liberer' and the Late Latin/Medieval English adoption of 'liberate', and in Modern English the adjective was formed by adding the suffix '-able' to 'liberate' to yield 'liberable'.

Initially the root 'liberare' meant 'to make free', but over time the English adjective 'liberable' developed the meaning 'capable of being freed' (i.e., 'able to be liberated').