The rank, position, or office of an ensign in the military; the state of being an ensign.
From 'ensign' (military rank, from Old French, ultimately from Latin 'insigne,' badge) + '-cy' suffix (denoting status, position, or office). Parallel formations include 'regency,' 'presidency,' and 'agency.'
The '-cy' suffix is how English creates nouns describing positions and states—'ensigncy' is one of many military rank designations that have become obsolete, but it follows the same pattern as modern words like 'presidency,' showing how the language extends metaphors of rule to any formal status.
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