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The Collaborative International Dictionary
Abbatical

Abbatical \Ab*bat"ic*al\ ([a^]b*b[a^]t"[i^]*kal), a. Abbatial. [Obs.] [1913 Webster] ||

Wiktionary
abbatical

a. (context obsolete English) (alternate form of abbatial English) (Attested from the mid 17th century until the mid 19th century.)(R:SOED5: page=3)