different between authorisation vs dispensation

English

authorisation (countable and uncountable, plural authorisations)

From Old French despensacion, from Latin dispens?ti?

dispensation (countable and uncountable, plural dispensations)

The act of dispensing or dealing out; distribution; often used of the distribution of good and evil by God to man, or more generically, of the acts and modes of his administration.
That which is dispensed, dealt out, or appointed; that which is enjoined or bestowed
A system of principles, promises, and rules ordained and administered; scheme; economy; as, the Patriarchal, Mosaic, and Christian dispensations.
The relaxation of a law in a particular case; permission to do something forbidden, or to omit doing something enjoined; specifically, in the Roman Catholic Church, exemption from some ecclesiastical law or obligation to God which a man has incurred of his own free will (oaths, vows, etc.).

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