Definitions for "Delta rule"
A powerful form of learning, also known as gradient descent learning, which suggests that following a particular action, the difference between the planned outcome and the actual outcome (the error) is calculated, and the system adjusted to reduce the error next time.
Learning rule which modifies old parameter value as a fraction of difference between desired and true value
The perceptron learning rule that specifies that weight changes should be proportional to the product of a weight's input and the error (or delta) term for the perceptron.