noun

• The ability to move; capacity for movement.
• (now chiefly literary) A tendency to sudden change; mutability, changeableness.
• (military) The ability of a military unit to move or be transported to a new position.
• (chiefly physics) The degree to which particles of a liquid or gas are in movement.
• (chiefly sociology) People's ability to move between different social levels or professional occupations.