(archaic) A dictatorial entity personified as female; that which dictates.
1756, George Anderson, A Remonstrance against Lord Bolingbroke’s Philosophical Religion cited in a review in The Monthly Review, Volume 16, 1757, p. 240,
[…] how can you […] plead a religious conscience as a dictatrix of what is morally good and evil, when you deny God’s moral attributes?
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