Capable of being driven; in good enough condition to be operated by a driver; passable for vehicles.
From 'drive' (from Old English 'drifan' meaning 'to move forward') + '-able' (suffix meaning 'capable of' or 'worthy of'), creating an adjective for something that can be driven.
The '-able' suffix is one of English's most powerful productivity machines—it can turn almost any verb into an adjective meaning 'capable of' or 'worthy of,' giving speakers infinite flexibility.
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