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ambulatory (adj.)

1620s, "pertaining to walking;" also "movable; shifting, not permanent," from Latin ambulatorius "pertaining to a walker; movable," from ambulator, agent noun from past participle stem of ambulare "to walk, go about" (see amble (v.)). Middle English had ambulary "movable" (mid-15c.). Related: Ambulatorial.

ambulatory (n.)

"part of a building intended for walking," 1620s, from Medieval Latin ambulatorium, from Latin ambulatorius "movable, of or pertaining to a walker," from ambulare "to walk, go about" (see amble (v.)).