(philately) a philatelically inspired letter flown on the first flight of a new airline service.

plural of first flight cover

plural of first-person shooter

plural of first-person plural

plural of first-person singular

plural of first-time buyer

(graph theory) An algorithm for traversing a tree or graph where one starts at the root and explores as far as possible along each branch before backtracking.

(astronomy) A point on the celestial sphere where the sun crosses the celestial equator on March equinox.

(politics) The first chain of major archipelagos out from the East Asian continental mainland coast. Principally composed of the Kuril Islands, Japanese Archipelago, Ryu Kyu Islands, Taiwan, the northern Philippines, and Borneo; from the Kamchatka Peninsula to the Malay Peninsula.

(computing) A continuation that can be used like any other value in a programming language, giving a powerful ability to control flow of execution.