(anatomy) Part of the human brain involved in emotion, motivation, and emotional association with memory; includes amygdala, cingulate gyrus, fornicate gyrus, hippocampus, hypothalamus, mammillary body, nucleus accumbens, orbitofrontal cortex and parahippocampal gyrus.

(physiology) A control system of ductless glands that secrete hormones which circulate via the bloodstream to affect cells within specific organs.

A physical system for organizing documents, as in a library or office. / (computing) A method of organizing blocks of data on a storage device into files and directories.

(immunology) An aspect of the innate immune system that supplements the actions of the antibodies and phagocytic cells in clearing out pathogens from an organism

(historical) A penal method of the 19th century in which prisoners worked during the day in groups and were kept in solitary confinement at night, with enforced silence at all times.

(Indo-European studies) A system which describes how certain Proto-Indo-European words are derived from one another.

(astronomy) A geocentric model of the solar system, described by the eponymous astronomer.

The system of measurements based on force, and independent of acceleration of gravity.

(mathematics) a set of equations required to be satisfied simultaneously or considered as a whole

(computing) A system for computing that includes the physical computing unit itself and its peripherals. / (computing) Any system based around computer technology, such as a software package.