1. (Naut.) Situated above the topmast and below the royal mast; designatb, or pertaining to, the third spars in order from the deck; as, the topgallant mast, yards, braces, and the like. See Illustration of Ship. [ 1913 Webster ]
2. Fig.: Highest; elevated; splendid. “The consciences of topgallant sparks.” L'Estrange. [ 1913 Webster ]
Topgallant breeze, a breeze in which the topgallant sails may properly be carried. [ 1913 Webster ]