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aboard

adverb, adjective, preposition, on, in, onto, or into (a ship, train, aircraft, etc)

abort

verb, to undergo or cause (a woman) to undergo the termination of pregnancy before the fetus is viable

above board

adjective, adverb, in the open; without dishonesty, concealment, or fraud

abrade

verb, to scrape away or wear down by friction; erode

abroad

adverb, to or in a foreign country or countries