Intolerance, n.
Etymology: [L. intolerantia impatience, unendurableness: cf. F. intolérance.]
1. Want of capacity to endure; as, intolerance of light.
2. The quality of being intolerant; refusal to allow to others the enjoyment of their opinions, chosen modes of worship, and the like; want of patience and forbearance; illiberality; bigotry; as, intolerance shown toward a religious sect. These few restrictions, I hope, are no great stretches of intolerance, no very violent exertions of despotism. Burke.
Shades of meaning
Fernald has no entry of its own for intolerance; 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