FromMiddle Frenchtoleration, fromLatintolerātiōnem, accusative singular oftolerātiō, from the verbtolerō(“I tolerate”). Comparetolerance.

• (UK)IPA^(key):/tɒləˈɹeɪʃən/

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toleration (countable anduncountable,pluraltolerations)

1. (obsolete)Endurance of evil, suffering etc.
2. Theallowance of something not explicitly approved;tolerance,forbearance.
3. Specifically, theallowance by a government (or other ruling power) of the exercise ofreligion beyond the state established faith.
   • 2012, Faramerz Dabhoiwala,The Origins of Sex, Penguin, published2013, page86:

     Above all, the establishment oftoleration helped to weaken the presumption that plurality in matters of faith inevitably caused social disorder.

•  Toleration on Wikipedia.Wikipedia
•  Toleration in theEncyclopædia Britannica (11th edition, 1911)