Semilinear or semi-linear (literally, "half linear") may refer to:
Mathematics Antilinear map, also called a "semilinear map" Semilinear order Semilinear map Semilinear set Semilinearity (operator theory) Semilinear equation, a type of differential equation which is linear in the highest order derivative(s) of the unknown function Various forms of "mild" nonlinearity are referred to as "semilinear"
Other Semilinear response, physics Artificial neuron, also called a "semi-linear unit" Semi-linear resolution A mixture of linear and nonlinear gameplay in video games may be referred to as "semi-linear gameplay"