All terms in this list:

advantageous: Being of advantage; conferring advantage; gainful; profitable; useful; beneficial; as, an advantageous position.

advent: Coming; coming to; approach; arrival.

aeronautics: The design, construction, mathematics and mechanics of aircraft and other flying objects

affliction: a state of pain, suffering, distress or agony

aggressive: Tending or disposed to aggress; characterized by aggression; making assaults; unjustly attacking.

alliance: The state of being allied; the act of allying or uniting; a union or connection of interests between families, states, parties, etc., especially between families by marriage and states by compact, treaty, or league; as, matrimonial alliances; an alliance

anonymous: Lacking a name; not named and determined, as an animal not assigned to any species.

antibiotic: Any substance that can destroy or inhibit the growth of bacteria and similar microorganisms.

anxiety: An unpleasant state of mental uneasiness or concern about some uncertain event.

appalling: Horrifying and astonishing.