Able to be obtained, acquired, or reached; feasible or attainable.
From 'get' (Old English 'gietan') plus the suffix '-able' (from Latin '-abilis'), creating a descriptive adjective meaning capable of being gotten or obtained.
The '-able' suffix is one of English's most productive word-creation tools—it can theoretically be added to almost any verb, which is why we get words like 'gettable' that seem obvious but don't always make it into dictionaries.
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