Factor

• Coagulation factors, substances essential for blood coagulation
• Environmental factor, any abiotic or biotic factor that affects life
• Enzyme, proteins that catalyze chemical reactions
• Factor B, and factor D, peptides involved in the alternate pathway of immune system complement activation
• Transcription factor, a protein that binds to specific DNA sequences

• Factor (programming language), a concatenative stack-oriented programming language
• Factor (Unix), a utility for factoring an integer into its prime factors
• Factor, a substring, a subsequence of consecutive symbols in a string
• Authentication factor, a piece of information used to verify a person's identity for security purposes
• Decomposition (computer science), also known as factoring, the organization of computer code
• Enumerated type: a data type consisting of a set of named values, called factor in the R programming language

• Factor, in the design of experiments, a phenomenon presumed to affect an experiment
• Human factors, a profession that focuses on how people interact with products, tools, or procedures
• Sun protection factor, a unit describing reduction in transmitted ultraviolet light

• A term in multiplication for a whole number by which a larger whole number can be divided
• Divisor, an integer which evenly divides a number without leaving a remainder
• Factorization, the decomposition of an object into a product of other objects
• Integer factorization, the process of breaking down a composite number into smaller non-trivial divisors
• A coefficient, a multiplicative factor in an expression, usually a number
• The act of forming a factor group or quotient ring in abstract algebra
• A von Neumann algebra, with a trivial center
• Factor (graph theory), a spanning sub graph
• Any finite contiguous sub sequence of a word in group theory

To break down [until you can't anymore].

• An independent categorical variable.
  • In experimental design, the factor is a category of treatments controlled by the experimenter.
• In factor analysis, the factors are unobserved underlying hidden variables that explain variability in a set of correlated variables.