What word should be avoided in conjunction with authorization for aircraft to taxi?

The term "cleared" should be avoided when authorizing aircraft to taxi because it has a specific and crucial meaning in air traffic control. In air traffic communications, "cleared" indicates that an aircraft has the authorization to take a specific action, such as taking off or landing, and is usually associated with the transition of control over the aircraft. When it comes to taxiing, using "cleared" might lead pilots to misinterpret the authorization, believing they have the same level of permission as they would when cleared for takeoff or landing.

Instead, terms like "approved," "permitted," or "validated" are more suitable as they convey a lower level of authorization that is appropriate for taxi operations. These terms help clarify the pilot's actions without implying that they have been given full clearance as they would for more critical phases of flight. This distinction is vital for maintaining clear and effective communication between air traffic control and pilots, thereby enhancing safety and operational efficiency on the airport ground.