English Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 019 advocate (n) One who pleads the cause of another, as in a legal or ecclesiastical court aerial (adj) Of, pertaining to, or like the air aeronaut (n) One who navigates the air, a balloonist aeronautics (n) the art or practice of flying aircraft aerostat (n) A balloon or other apparatus floating in or sustained by the air aerostatics (n) The branch of pneumatics that treats of the equilibrium, pressure, and mechanical properties affable (adj) Easy to approach affect (v) To act upon