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equilateral having all the sides or faces equal.
equilibrium a state of balance between two or more forces.
equinox either of the two times during the year when the sun's rays are perpendicular to the earth's equator, occurring in March and September. During the equinox, day and night are both 12 hours long all over the world.
equip to provide with what is needed to complete a task.
equipment things made, or used, for a particular activity. [2 definitions]
equivalent the same as or equal to another in force, value, measure, or meaning. [2 definitions]
-er1 a suffix that means "one who performs an action." [2 definitions]
-er2 a suffix used to change the form of short adjectives and adverbs to make them express the idea of more when compared.
era a period of time in history. An era often begins or ends with an important event.
eradicate to do away with completely; wipe out.
erase to remove by rubbing, wiping, or scraping away. [2 definitions]
eraser an object used to erase or rub out writing or marks.
ere before. This word is used in poems and stories written long ago.
erect upright in posture or position. [4 definitions]
Erie Lake Erie, the most southern of the Great Lakes. It lies between the United States and Canada. [2 definitions]
Eritrea a country on the Red Sea that is bordered by Sudan and Ethiopia. The capital of Eritrea is Asmara.
ermine a weasel that has white fur in the winter. Ermines live in very cold regions of North America, Europe, and Asia.
erode to wear away or eat into.
erosion wearing away of the earth's surface by wind or water.
errand a quick trip taken for a particular purpose. [2 definitions]
erratic not expected or predicted; not regular. [2 definitions]