| acoustics |
the aspects of a room or space that make sounds easy or difficult to hear (used with a plural verb). |
| action |
(usually plural) way of acting or behaving. [1/6 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. |
| aerobics |
(used with a singular or plural verb) a form of exercise that works the heart and lungs to help the body use oxygen better. Running, swimming, biking, or dance are forms of aerobics. |
| affair |
(plural) public or business matters. [1/5 definitions] |
| algae |
organisms that live mainly in the water and make their food through photosynthesis. Algae are different from plants in that they have no true leaves, roots, or stems. Seaweeds are algae. "Algae" is a plural noun; the singular form is "alga." |
| amends |
(used with a singular or plural verb) something given or paid to make up for a wrong done to a person or group. |
| America |
(plural) the lands of North and South America, including the lands of Central America and the Caribbean islands (preceded by "the"). [1/3 definitions] |
| appearance |
(plural) outward signs. [1/4 definitions] |
| are1 |
a form of the verb "be" that is present tense and used with the pronouns "you," "we," or "they." It is also used with plural nouns. |
| arm2 |
(usually plural) weapons. Guns, knives, and bombs are arms. [1/3 definitions] |
| armament |
(usually plural) the total military power of a country, including weapons and supplies. |
| arrangement |
(usually plural) plans or preparations. [1/5 definitions] |
| asset |
(plural) property that can be exchanged for cash. [1/2 definitions] |
| athletics |
(usually used with a plural verb) sports and physical activities. |
| attention |
(usually plural) acts of respect, care, or politeness. [1/4 definitions] |
| authority |
(usually plural) people who have this right or power by law. [1/3 definitions] |
| Bahamas |
(used with a plural verb) a chain of islands southeast of Florida. [1/2 definitions] |
| barrack |
(usually plural) a building where soldiers live for a short amount of time. |
| basic |
(often plural) the basic knowledge or skills required to do something. [1/3 definitions] |
| battlement |
(often plural) a wall along the top of a castle, fort, or tower that has openings for people to shoot through. |