menology
The study of months; the names and system of months within a given calendar.
uncommon
...in Afghanistan, we find two systems of month-names. One of these... is of Indian origin..., while the other is borrowed from the Mohammedan menology...
The content of a menologium, a liturgical calendar or hagiography.
rare
Their readings from the holy Scriptures and from the fathers, from the menologies of the church and the teachings of its principal pastors, are a great, continually swelling hymn of praise to the rule of providence and to the progressive actualization of the eternal plan of salvation.
Where it comes from
Partially from meno- (“month-”) + -ology (“study, account”) and partially from anglicization of Medieval Latin mēnologium and Byzantine Greek μηνολόγιον (mēnológion), q.v. Doublet of menologion, menologium, and menologe.
Adapted from the Wiktionary entry menology (CC BY-SA 4.0).