| acre |
a unit of area equal to 43,560 square feet, used to measure land. The acre is a standard unit of measurement in the United States and the United Kingdom. |
| admiral |
an officer in the United States Navy of the highest rank; the commander of a fleet of ships or military unit. |
| atom |
the smallest possible unit of a chemical element. The major parts of atoms contain protons, neutrons, and electrons. They are the basis of all matter in the universe. [1/2 definitions] |
| biomass |
the total amount of living things in a particular environment, measured by mass per unit of area or volume. |
| bit3 |
the smallest unit of information in a computer. |
| block |
a group of people or things considered as a single unit. [1/9 definitions] |
| bushel1 |
in the US, a unit of measure equal to 4 pecks or 32 quarts, used for measuring grain and other dry products. [2 definitions] |
| byte |
a basic unit of information in computers. A byte is usually equal to eight binary digits or bits. |
| calorie |
a unit for measuring the amount of energy that a food can produce when taken into the body. The more calories something has, the more energy it can provide for the body.(abbreviated: Cal.) |
| camcorder |
a portable video recording device that includes a camera and a videocassette recorder in one unit. |
| carat |
a unit of weight for diamonds and other gems, equal to one-fifth of a gram. |
| cell |
a tiny unit of plant or animal life, having a nucleus and surrounded by a very thin membrane. [1/4 definitions] |
| cent |
a unit of money used in many countries, including the United States and Canada. A cent is equal to a hundredth part of the standard national currency. |
| centimeter |
a unit of length equal to one hundredth of a meter or 0.3937 inch. (abbreviated: cm) |
| century |
a unit of time equal to one hundred years. [1/2 definitions] |
| chaplain |
a member of the clergy who leads religious services and does counseling for a military unit, a hospital, or other group. |
| commander |
an officer who is the leader of a military unit. [1/3 definitions] |
| cup |
a unit of measure equal to eight fluid ounces or one half pint. (abbreviated: c) [1/5 definitions] |
| day |
a unit of time equal to the twenty-four hours included in one day and night. [1/3 definitions] |
| decade |
a unit of time equal to ten years. |
| decibel |
a unit used to measure the loudness of sound. (abbreviated: dB) |