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In Computing:
- Database is an organized collection of data.
  - it is the name of the database for OpenOffice.org
- Google Base is an online database service from Google.
In Mathematics:
- A number that is raised to a power; the base of an Exponential function. This finds common use, for example, in the depiction of numbers, for instance, 10 is the base used in the Decimal system, whereas 2 is the base in the Binary numeral system. See also Numeral system, Radix and Table of bases.
- The base of a logarithmic function.
- One of the parallel sides of a Trapezoid or the unequal side of an isosceles triangle.
- In Topology, a Base (topology) for a topology is a set of open sets such that every element of the topology is a union of the base sets. See also Subbase.
- Base of a transform in mathematics
In Politics:
- base is a Political party's core group of voters.
- As modified by the word Tax, it refers to how much income and assets one has, earns, spends, inherits, etcetera as used in the formula to decide owed tax (example: owed_tax = (base times tax_percent) minus deductible).
In warfare, a Military base is a Logistics point such as a supply dump and a concentrated facility for storing and repairing military equipment such as an Air force base.
- In 2001, the catchphrase "All your base are belong to us" swept across the Internet.
In Sport
- Baseball, a base is one of 4 bags or plates placed at corners of the infield diamond that a player has to run to after hitting the ball.
- BASE jumping is an extreme variation on skydiving.
In a Transistor the base is the controlling connection to the Junction.
In Marxism describes the material equipment and material relations of human society, as distinct from the 'superstructural' forms of society - laws, customs, ideas, beliefs, etc.
The name of the terrorist group Al-Qaida translates as "the base."
In Chemistry, a base is the reactive complement to an acid. See Acid-base reaction theories.
- With reference to drugs, base is a Colloquialism for amphetamine or freebase cocaine.
In Genetics, a Base pair consists of two complimentary DNA or RNA nucleotides joined by hydrogen bonds.
In Linguistics, a base is a synonym for root word.
In telecommunications, Base is a mobile telephony company in Belgium, a subsidiary of the Dutch telecommunications company KPN.
An isolated settlement in inhospitable conditions that must rely on outside help in order to survive, such as Antarctica base or Moon base.
In architecture, a base is the part of a Column between the bottom of the shaft and the top of the pedestal.
An easily-confused homonym for Bass (disambiguation), referring to various usages of bass and to basso, the vocal range.