(physics) A localized physical system consisting of interacting components, called degrees of freedom

A school of psychology that seeks to address people not on an individual level, as was the focus of earlier forms of therapy, but as people in relationships, dealing with the interactional patterns and group dynamics.

A manner of responding to challenges with quick thinking and improvisation.

A fire alarm system.

plural of block system

A convention whereby Esperanto’s circumflex accents (ĉ, ĝ, ĥ, ĵ, ŝ, ŭ) are replaced by an x after the non-diacriticked letter (cx, gx, hx, jx, sx, ux), for convenience of typing.

A convention whereby Esperanto’s circumflex accents (ĉ, ĝ, ĥ, ĵ, ŝ) are replaced by an h after the letter (ch, gh, hh, jh, sh) and the breve (ŭ) is left out entirely (u), for convenience of typing.

plural of lymphatic system

An early automated flour roller mill system.

(aviation, travel) Airline baggage allowance that restricts passengers to a specific number of bags, rather than a specific weight.