Capable of being extended, stretched out, or made to reach farther or longer.
From Latin extendere plus the suffix '-ible' (or '-able'), meaning 'capable of being.' This suffix creates adjectives from verbs.
The difference between 'extendible' and 'extensible' is super subtle (both come from the same Latin root!), but 'extensible' is more common in modern English, especially in computing and technology contexts.
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