Webster’s Revised Unabridged Dictionary · 1913
Divisional
Di·vi′sion·al (dĭ·vĭzh′ŭn·al), a. That divides; pertaining to, making, or noting, a division; as, a divisional line; a divisional general; a divisional surgeon of police.
Divisional planes (Geol.), planes of separation between rock masses. They include joints.