(parapsychology) A haunting in which a specter repeats a loop of it's past, with no semblance of intelligence or consciousness.

(statistics) the sum of the squared residuals between some model and a dataset; a measure of how well the model fits with the data

(electricity) An automatic circuit breaker that rapidly disconnects an electric circuit when the imbalance of the currents going through it exceeds a specific value.

(law) The part left over (especially of an estate).