Noun
propers
plural of proper
propers pl (plural only)
(slang) proper treatment, respect
When a feast on the moveable cycle occurs, the feast on the fixed cycle that was set for that calendar day is transferred, with the propers of the feast often being chanted at Compline on the nearest convenient day. Source: Internet
It also set out in full the " propers " (that is the parts of the service which varied week by week or, at times, daily throughout the Church's Year): the collects and the epistle and gospel readings for the Sunday Communion Service. Source: Internet