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addiction the condition of being addicted, especially to something that is not good for one's health.
addition the act or process of adding. [3 definitions]
additional more; added.
additive a substance added to another substance in small amounts to change or improve it.
address a formal speech or talk. [6 definitions]
adenoid (usually plural) a mass of tissue that grows behind the nose in the upper part of the throat. When swollen, the adenoids can make breathing difficult.
adept having great skill or ability.
adequate enough for the situation or need.
adhere to stick or cling firmly (usually followed by "to"). [2 definitions]
adhesive able or likely to stick to something; clinging. [2 definitions]
a dime a dozen (informal) plentiful and easy to get; common; cheap.
adios a word that means "good-bye" in Spanish.
adjacent near or next to.
adjective a word that describes or modifies a noun or pronoun. In the sentence, "It was a hard test," the word "hard" is an adjective.
adjoin to be next to; border on.
adjoining being side by side, or touching.
adjourn to stop the process of a formal meeting or court session, often with the intention of starting again at another time.
adjust to bring to a better state or position; make fit. [3 definitions]
adjustment the act or process of changing or fixing something.
ad-lib to make up as one goes along; say or do something without practice or planning. [2 definitions]
administer to manage, take care of, or be in charge of. [3 definitions]