Relating to or characteristic of Monte Cassino, the famous Benedictine monastery in Italy, or its monks and traditions.
From Cassino (the place) plus -ese, a suffix meaning 'of or relating to' a particular place or people, as in 'Milanese' or 'Lebanese.'
Monte Cassino monastery sits on a mountain top in Italy and has been destroyed and rebuilt several times throughout history—it's basically the cockroach of buildings!
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