Base or BASE may refer to: Base meaning bottom, the lowest part of an object can mean negative, unfavorable or undesirable in nature. Bad; vile; malicious; evil. In mathematics: Base (arithmetic), the number b in an expression of the form bn, hence also the number of digits (known also as the radix) in a positional numeral system, for example, base 10 Base (topology), a topological space Base (group theory) One of the sides of a trapezoid or triangle In the sciences: Base (chemistry),… (More on Base)