letter of brotherredn. a letter of acknowledgement granted by a religious order to its benefactors or adherents, entitling them to share in the benefits of the prayers and good works of the order; = letter of brotherhoodn. at brotherhoodn. Phrases.
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a1500 (a1419) Jack Upland (Harl.) l. 187 in P. L. Heyworth Jack Upland (1968) 62 Whi axe ȝe not lettris of briþered [a1525 Cambr. boyerhede] of oþer pore mennes preieris?