Word library

Rain that has become more acidic than normal because pollutants like sulfur dioxide have dissolved into it.

The level of acid in a substance, often measured on the pH scale.

Sharp or bitter in taste or tone.

To admit that something is true, or to show that you have noticed someone or something.

The highest point of achievement or excellence.

The small nut produced by an oak tree, with a rough cup-shaped base.

Relating to sound or the sense of hearing, or, for a musical instrument, not electronically amplified.

The qualities of a room or space that affect how sound is heard within it.

To accept something without protest, even without full agreement.

To gain or obtain something, often through effort, skill, or money.

The act of getting or gaining something, especially property, skills, or another company.

A unit for measuring land area.

Having a strong, bitter smell or taste that is unpleasant, often irritating to the nose or throat.

Full of bitterness and anger, especially in an argument or disagreement.

Bitterness and anger, especially in the way people speak to each other.

A word made from the first letters of a group of words and pronounced as one word instead of spelled out.

From one side of something to the other.

To do something, or to perform a role in a play or film.

Something that is done, or the process of doing something.

To make something start working or become active.

Full of energy, and involved in doing things regularly.

The movement of substances across a cell membrane from a lower to a higher concentration, using energy from the cell.

A way of writing a sentence in which the subject performs the action, as in 'the dog chased the ball'.

Vigorous effort to bring about political or social change, usually through public action.

A person who works actively to bring about political or social change.

Something you do for enjoyment, exercise, or a particular purpose.

A person who performs a role in a play, film, or television show.

A woman who performs in plays, movies, or television shows.

Real and existing in fact, rather than what was expected, believed, or guessed.

In fact, used to say what is really true, often correcting a wrong assumption.

A professional who uses statistics and mathematics to calculate risk, especially for insurance companies.

Sharpness of thought, vision, or hearing.

Sharp judgment and quick, practical understanding, especially in business or a specific field.

Very sharp, sudden, or intense, or extremely sensitive in perception.

An angle that measures less than ninety degrees.

A short piece of media used to promote a product, service, or event.

Completely unwilling to change your mind or position, even under pressure.

Extremely hard and unyielding, like a diamond, often describing someone's will or determination.

To change your behavior or something's form so it fits a new situation better.

The ability to adjust easily to new conditions or situations.

A change that helps a living thing survive better in its environment, or the process of adjusting to new conditions.

Able to change or adjust easily in response to new conditions.

To put something together with something else, or to combine numbers to find a total.

A number that is added to another number in an addition problem.

The process of adding numbers together, or something added to a group of things.

Extra, added to what already exists.

A substance added to something else in small amounts, usually to improve or preserve it.

The details of where a building or place is located, used for finding it or sending mail.