"Aboard" is a sailing term meaning to be on or in a vessel, synonymous with "on board". It indicates that a person or object is securely on the boat. A related phrase, "close aboard," signifies that something is near a ship.

Key Aspects of "Aboard":
Location: Used to describe being inside the hull or on the deck.

"All Aboard": A warning announcement before a ship leaves.

Related terms: "Abaft" (toward the stern), "Abeam" (90 degrees to the side), and "Aloft" (above the deck).