WordNet sense 1 (a shortened version of a written work):

abridgement, abridgment, condensation

WordNet sense 2 (a spacecraft designed to transport people and support human life in outer space):

space capsule

WordNet sense 3 (a pilot's seat in an airplane that can be forcibly ejected in the case of an emergency; then the pilot descends by parachute):

ejection seat, ejector seat

WordNet sense 4 (enclose in a capsule):

capsulize, capsulate, capsulise

WordNet sense 5 (put in a short or concise form; reduce in volume):

encapsulate