'redirectable' originates from English, specifically the word 'redirect' combined with the suffix '-able', where 're-' meant 'again', 'direct' comes from Latin 'directus' meaning 'straight' or 'to guide', and the suffix '-able' comes from Latin 'abilis' meaning 'able to be'.

'redirectable' was formed in Modern English by adding the English suffix '-able' to the verb 'redirect'. The verb 'redirect' developed from Middle English/Old French usage of 'direct' (from Latin 'directus') with the prefix 're-'.

Initially, 'redirect' meant 'to direct again'; over time it came to be used for sending or routing something to a different place. Consequently, 'redirectable' evolved from 'able to be directed again' to the current sense 'able to be sent/routed to another location'.