Algebra :: Algebra (n.) That branch of mathematics which treats of the relations and properties of quantity by means of letters and other symbols. It is applicable to those relations that are true of every kind of magnitude.
Algebra :: Algebra (n.) A treatise on this science.
Algebraical :: Algebraical (a.) Of or pertaining to algebra; containing an operation of algebra, or deduced from such operation; as, algebraic characters; algebraical writings..