The act or process of passing, especially: A movement from one place to another, as by going by, through, over, or across; transit or migration. The process of elapsing: the passage of time. The process of passing from one condition or stage to another; transition: the passage from childhood to adulthood. Enactment into law of a legislative measure. A journey, especially one by air or water: a rough passage on the stormy sea. The right to travel as a passenger, especially on a ship: book passage; pay for one's passage. The right, permission, or power to come and go freely: Only medical supply trucks were granted safe passage through enemy territory. A path, channel, or duct through, over, or along which something may pass: the nasal passages. A corridor. See Synonyms at way. An occurrence or event: "Another encouraging passage took place . . . when heads of state . . . took note of the extraneous factors affecting their economies that are beyond their control\u201d ( Helen Kitchen). Something, such as an exchange of words or blows, that occurs between two persons: a passage at arms. A segment of a written work or speech: a celebrated passage from Shakespeare. Music A segment of a composition, especially one that demonstrates the virtuousity of the composer or performer: a passage of exquisite beauty, played to perfection. A section of a painting or other piece of artwork; a detail. Physiology An act of emptying, as of the bowels. Biology The process of passing or maintaining a group of microorganisms or cells through a series of hosts or cultures. Obsolete Death. A slow cadenced trot in which the horse raises and returns to the ground first one diagonal pair of feet, then the other. To execute such a trot in dressage. To cause (a horse) to execute such a trot in dressage.