The state, skill, or rank of being an adept; mastery or expertise in a particular field.
Formed from 'adept' plus the Old English suffix '-ship,' which denotes a state, condition, or position (as in 'friendship' or 'leadership'). The suffix has been used since before the 12th century to create nouns indicating qualities and ranks.
This word shows how English speakers take any noun they like and add '-ship' to it—we've been doing this for over a thousand years, which is why you can say everything from 'craftsmanship' to 'authorship' to, well, 'adeptship.'
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