ACT Vocabulary List part 1

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Abound: to be well supplied; to have great quantities

Absence: being away or lacking something; inattentiveness

Absurd: extremely ridiculous or completely lacking reason

Abundance: having considerably more than is necessary or adequate; more than plenty

Acceleration: the rate of change of velocity

Accommodate: to adapt or adjust in a way that makes someone else comfortable; to make room

Accusation: a statement blaming someone for a crime or error

Acidic: having a pH less than 7 (contrast with alkalinity, which is having a pH greater than 7)

Acrid: harsh or bitter taste or smell

Acute: (adj.) refers to an angle that is less than 90 degrees; (adj.) refers to a triangle with angles that are all less than 90 degrees; sharp; quick and precise; intense

Adapt: to change or modify to suit a particular purpose

Adjacent: in the nearest position; next to

Adolescence: the stage of development between puberty and maturity

Aerobic respiration: the breakdown of glucose in the body of an animal to supply muscles with oxygen

Aerosol: solid or liquid particles suspended in gas

Aesthetic: appeals to the senses because it is beautiful

Affiliation: a connection between groups of people, organizations, or establishments

Agility: the quality of being quick and nimble

Agronomist: a soil management and field-crop production expert

Alienate: to isolate oneself from others or another person from oneself

Align: to adjust parts so that they fit together correctly, usually in a straight line

Alkalinity: having a pH greater than 7 (contrast with acidic, which is having a pH less than 7)

Allegiance: loyalty to a person, group, country, or cause

Altitude: elevation above a level of reference, usually given in feet above sea level

Ambiguous: unclear or capable of having more than one meaning

Amino acids: various organic compounds that link together to form proteins

Ample: a more-than-sufficient amount; roomy

Analogous: items that are similar and comparable in some way; serving a similar function

Analogy: a comparison of similarities between two or more things

Anatomical: related to the structure of an organism

Ancestral: relating to or inherited from an ancestor

Anew: starting again in a new or different way

Anomaly: something that is different from the norm

Anticipate: to look forward to or to expect

Antigen: a substance such as a toxin or enzyme capable of eliciting an immune response

Antitoxin: an antibody created for and capable of neutralizing a toxin

Apathy: lack of any emotion or concern

Aperture: an opening or hole, usually in an optical instrument, such as a camera, that limits the amount of light passing through a lens

Apocalypse: great or total devastation; approximating the end of the world

Apparatus: a material or device used for a specific purpose

Appealing: attractive or inviting; the act of making a request for a decision or help

Arisen: the state of being up after sitting or lying

Aristocratic: having the qualities of the elite, ruling class

Articulate: (v.) to clearly explain; (adj.) the quality of being able to speak clearly

Aspect: a certain part of something; the side of an object that faces a certain direction

Assert: to demonstrate power; to defend a statement as true

Assumption: something believed to be true without proof; unsupported evidence

Asteroid: small celestial body that revolves around the sun, with a diameter between a few and several hundred kilometers

Asthenosphere: a lower layer of the Earth's crust

Astonishing: amazing or bewildering

Atrium: an area of a building, usually a courtyard, that is skylighted or open to the sky and that often contains plants


Bacteria: single-celled microorganisms

Banish: to force to leave; to exile

Banyan: East Indian tree that has aerial shoots growing down into the soil and forming additional trunks; loose jacket worn in India

Basalt: solidified lava; a dense, gray, fine-grained igneous rock

Bemoan: to express grief; to deplore

Beneficiary: recipient of benefits, for example, funds or property from an insurance policy or will

Binge: a duration of excessive and uncontrolled self-indulgence

Biomass: total mass of all the living matter within a given area

Biosynthesis: the production of a chemical compound within the body

Boiling point: the temperature a liquid must be to change states from liquid to gas

Brood: (v.) to dwell over past misfortune; (n.) a group of offspring

Buoyant: tending to float; lighthearted

Bureaucrat: an official in government; a term usually used in an insulting manner

By-products: products made in the process of making something else, sometimes unexpected

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