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reaction a movement, action, or response in reverse direction or manner. [6 definitions]
reactionary characterized by reaction, esp. political movement toward extreme conservatism. [2 definitions]
reaction engine an engine, such as a rocket or jet engine, that develops forward thrust by the rearward expulsion of matter, esp. ignited fuel gases.
reaction formation in psychoanalysis, the expression of a behavior that is opposite to a repressed impulse.
reaction time the interval of time between a stimulus and a response.
reactivate to restore to an active state or operating condition.
reactivation combined form of activation.
reactive characterized by reaction or response to a stimulus; tending to react.
reactor in physics, an apparatus for starting and controlling a nuclear chain reaction; nuclear reactor. [2 definitions]
read1 to examine and comprehend the meaning of (something written). [16 definitions]
read2 past tense and past participle of read1.
readable enjoyable or interesting to read. [2 definitions]
read between the lines to discern implied meaning from what is actually said or written.
readdress to alter or correct an address on (an envelope, package, or the like). [2 definitions]
reader a person who reads. [5 definitions]
readership the collective body of readers of a newspaper, magazine, or other publication.
readily promptly or easily. [2 definitions]
readiness the state of being willing, available, or ready. [2 definitions]
reading the action or activity of examining and comprehending written language. [8 definitions]
reading room a room, esp. designated for reading or quiet study as in a library.
readjust to bring once again to a more fitting or more correct state, relationship, position, or the like; to adjust again. [2 definitions]