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algebra a form of mathematics used to solve problems in which some of the numbers are not known. In an algebra problem, letters stand for the unknown numbers.
anonymous having an unknown name or identity.
experiment a carefully planned test used to discover something unknown. [1/2 definitions]
exploration the act of exploring new or unknown places. [1/2 definitions]
mutt a dog of mixed or unknown breed; mongrel.
uncharted not recorded on any map or chart; unexplored or unknown, as some geographical area or field of research.
x2 an unknown number in algebra. [1/4 definitions]
y an unknown number in algebra. [1/2 definitions]