<p><strong>Verb</strong></p><ul><li>(used without object) to bring forth a fetus from the uterus before the fetus is viable; miscarry.</li><li>to develop incompletely; remain in a rudimentary or undeveloped state.</li><li>to fail, cease, or stop at an early or premature stage.</li><li>Military: to fail to accomplish a purpose or mission for any reason other than enemy action.</li><li>Rocketry: (of a missile) to stop before the scheduled flight is completed.</li><li>(used with object) to cause to bring forth (a fetus) from the uterus before the fetus is viable.</li><li>to cause (a pregnant female) to be delivered of a nonviable fetus.</li><li>to cause to cease or end at an early or premature stage: We aborted our vacation when the car broke down.</li><li>to terminate (a missile flight, mission, etc.) before completion.</li><li>to put down or quell in the early stages: Troops aborted the uprising.</li></ul><p><strong>Noun</strong></p><ul><li>a missile, rocket, etc., that has aborted.</li></ul>