Someone who guides, especially someone hired to show people around a place or an institution and offer information and explanation. A document or book that offers information or instruction; guidebook. A sign that guides people; guidepost. Any marking or object that catches the eye to provide quick reference. A device that guides part of a machine, or guides motion or action. A spirit believed to speak through a medium. A member of a group marching in formation who sets the pattern of movement or alignment for the rest.

To serve as a guide for someone or something; to lead or direct in a way; to conduct in a course or path. To steer or navigate, especially a ship or as a pilot. To exert control or influence over someone or something. To supervise the education or training of someone. To act as a guide.