16) infra- (below in a range, beyond) infrastructure , infrared
17) re- (again, back to a former state) react, reaction, recall, recede , receipt, recipient , reclaim , recognize, recognition, record, recorder, recover, recovery, recreation, recur , recycle , redundant , reflect, reflection, reflexion, reform, refrain , refresh, refreshment , refund , refute , reinforce, reject, remember, remind, removal, remove, renaissance , renew, repay , repeat, repeatedly, repel , repetition, replace, replacement, reply, report, reporter, represent, representative, repression , reproduce, respect, respond, response, responsibility, responsible, restore, resume, return, reunion , reuse, review, revise, revive, revolt, revolution, revolutionary, revolve, reward
18) co-, col-, com-, con-, cor- (with together) co-existence, cooperate, cooperative , co-author, coalition , coherent , coincide , coincidence , collaboration , colleague, collide , collision, collocation, compassion, compassionate, concentric, confederation, conjoin, coordinate, correlate, correlation, correspond
19) inter- (between, among) international, interchange, interchangeable, interdependent, interpersonal, interview, interact , interaction, intercourse , interface , interfere, interference, Internet, interrupt, interval, intervene
20) macro- (large) macroeconomics , macrocosm , macrostructure
21) micro- (extremely small) microcomputer, microeconomics , microscope, microphone, microsurgery, microelectronics, microbiologist
22) super- (greater or more than) super, supermarket, supersonic , superman, superpower, supernatural, supervise , superb, superficial, superintendent , superior, superiority , supreme, supersystem
23) sur- (more than, beyond) surplus, surtax, surface, surpass , surround, survival, survive, suspect
24) ultra- (beyond, very, too) ultramodern, ultrasound, ultra-violet
25) auto- (of or by oneself) auto, autocriticism, autoland, automobile, automation , automatic, autobiography , autonomous , autonomy
26) mal- (bad, badly) malfunction, maltreat , malnutrition , malpractice
27) tele- (at or over a long distance, by or for television) telegram, television, telegraph, telephone, telecommunications , telescope, telescreen, teleswitch, televise
28) semi-, hemi- (half) semicircle, semiconductor, semi-colony , semifinal, hemisphere
29) uni-, mono- (one) uniform, unify , union, unique, unit, unite, unity, universe, universal, university, monologue , monoplane, monopoly , monotone, monotonous , carbon monoxide
30) bi-, di- (two) biweekly, bicycle, bilateral , billion, bilingual, dialogue, carbon dioxide
31) tri- (three) tricycle , triangle, triangular, trilogy , triple, trigonometry
32) quadri-, quadru- (four) quadruple, quadrangle
33) penta- (five) pentagon, Pentagon, Pentium
34) hexa- (six) hexagon, hexangular
35) sept- (seven) September, Sept-Wolves
36) octa- (eight) octagon, octave, octopus, October
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