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100

provide lodging or sufficient space for

Accommodate

100

a person's knowledge or experience of something

Acquaintance

100

existing, happening, or operating in the air

Aerial

100

not named or identified

Anonymous

100

a regretful acknowledgment of an offense or failure

Apology

200

restrain oneself from doing or enjoying something

abstain

200

an asset or object bought or obtained, typically by a library or museum

Acquisition

200

a person who is incompetent or inept at a particular activity

Amateur

200

a thing or event that existed before or logically precedes another

Antecedent

200

a punctuation mark used to indicate either possession or the omission of letters or numbers

Apostrophe

300

gather or acquire an increasing number or quantity of

accumulate

300

a judgment that a person is not guilty of the crime with which the person has been charged

Acquittal

300

an official pardon for people who have been convicted of political offenses

Amnesty

300

a medicine taken or given to counteract a particular poison

Antidote

300

a tube-shaped sac attached to and opening into the lower end of the large intestine in humans and some other mammals

Appendices

400

having experienced it often enough for it to seem normal

accustomed

400

the period following the onset of puberty during which a young person develops from a child into an adult

Adolescence

400

a short amusing or interesting story about a real incident or person

Anecdote

400

relating to or denoting substances that prevent the growth of disease-causing microorganisms

Antiseptic

400

a person who makes a formal application for something, especially a job

Applicant

500

the properties or qualities of a room or building that determine how sound is transmitted in it

acoustics

500

involving or creating favorable circumstances that increase the chances of success or effectiveness; beneficial

Advantageous

500

the feeling or state of being annoyed; irritation

Annoyance

500

experiencing worry, unease, or nervousness, typically about an imminent event or something with an uncertain outcome

Anxious

500

close to the actual, but not completely accurate or exact

Approximate