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activation code	a set of characters, consisting of numbers, letters, characters, or a combination of these, that is sent by a website to a user's email so that the website can verify the user's email address and comply with the user's request to begin a new service or change personal information. Once received, the user enters the code into the provided box on the website so that fulfillment of the user's request can begin.
afresh	once again; anew.
anew	once again; afresh. [1/2 definitions]
annual	happening once every year. [2/4 definitions]
Aral Sea	formerly, a very large, single lake in Central Asia. Once one of the world's largest lakes, the Aral Sea has vastly diminished in volume of water and has divided into separate parts as a result of the diversion, for agricultural purposes, of the rivers that fed the lake. The southeastern part of the Aral Sea has become entirely dry.
Arawak	a member of an Indian people once widespread throughout the West Indies, now living chiefly in northern South America. [1/2 definitions]
atom	an invisible component of any element, consisting of protons, neutrons, and electrons, once considered the smallest possible unit of matter. [1/2 definitions]
aurochs	an extinct wild ox once common in northern Africa, Europe, and western Asia, and probably an ancestor of domestic cattle. [1/2 definitions]
bedstraw	a small herb with paired leaves and small flowers once used as stuffing for mattresses.
bi-	once every two (specified periods). [1/3 definitions]
bicentennial	occurring once every two hundred years. [1/4 definitions]
biennial	an event occurring once every two years. [1/5 definitions]
bimonthly	a publication that appears once every two months. [1/3 definitions]
binocular	(usu. pl.) a magnifying optical instrument used with both eyes at once, such as field glasses or opera glasses. [1/2 definitions]
bioflavonoid	any of a group of yellow hydrocarbon pigments found in many flowers and fruits, once thought to be important as a vitamin in humans; vitamin P.
biweekly	a periodical published once every two weeks. [1/3 definitions]
Byzantine	of or pertaining to Byzantium, the empire once centered there, or its culture, artifacts, institutions, or the like. [1/3 definitions]
cap and bells	a cap with bells on it, once worn by court jesters; fool's cap.
centennial	occurring once every one hundred years. [1/4 definitions]
century plant	a desert agave, once believed to flower only once in a century, with fleshy leaves and a very tall stem on which greenish flowers appear every ten to twenty years.
chlorofluorocarbon	any of a group of compounds containing carbon, chlorine, and fluorine, which were once commonly used as refrigerants, solvents, and aerosol propellants but are now being phased out as they contribute to ozone depletion (abbreviated CFC.)

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