Bigotry, n.
Etymology: [Cf. F. bigoterie.]
1. The state of mind of a bigot; obstinate and unreasoning attachment of one's own belief and opinions, with narrow-minded intolerance of beliefs opposed to them.
2. The practice or tenets of a bigot.
Shades of meaning
Fernald has no entry of its own for bigotry; he lists it under fanaticism.
Where he writes about it:
Fanaticism is extravagant or even frenzied zeal; bigotry is obstinate and unreasoning attachment to a cause or creed; fanaticism and bigotry usually include intolerance, which is unwillingness to tolerate beliefs or opinions contrary to one's own; superstition is ignorant and irrational religious belief. — from fanaticism
Bigotry is narrow, fanaticism is fierce, superstition is ignorant, credulity is weak, intolerance is severe. — from fanaticism
Bigotry has not the capacity to reason fairly, fanaticism has not the patience, superstition has not the knowledge and mental discipline, intolerance has not the disposition. — from fanaticism
Bigotry, fanaticism, and superstition are perversions of the religious sentiment; credulity and intolerance often accompany skepticism or atheism. — from fanaticism