're-routable' originates from English, specifically formed from the prefix 're-' (from Latin 're-' meaning 'again'), the word 'route' (from Old French 'route' meaning 'way'), and the adjectival suffix '-able' (from Old French/Latin meaning 'capable of').

'route' came into English from Old French 'route' (meaning 'way' or 'path'), ultimately from Latin roots related to 'rupta' (a broken way). The verb 'reroute' was created by prefixing 're-' to 'route', and the adjective 're-routable' was formed by adding '-able' to indicate capability.

Initially a literal composition meaning 'able to be routed again'; the current use retains that sense and is applied broadly to physical routes, deliveries, traffic flows, and data/network paths.