1. 1. a (an)~> no, not, without, lacking Amnesia: a (without) mne (memory) ia (condition, state of) Anarchy: an (without) arch (rule, government) y (result of) Atheist: a (lacking, without) theo (god) ist (one who) Lesson 1

2. 2. Ambi ~> both Ambiguous: ambi (both) ag (do, drive) ous (full of) Ambidextrous: ambi (both) dextro (right-handed) ous (full of) Ambivalent: ambi (both) val (strong) ent (full of) Lesson 1

3. 3. Anti ~> against Antidote: anti (against) dot (give) Antibiotic: anti (against) bio (life) ic (having characteristics of) Antisocial: anti (against) soc (society) al (having characteristics of) Lesson 1

4. 4. Circum ~> around Circumference: circum (around) fer (carry) ence (state or condition) Circumscribe: circum (around) scribe (write) Circumnavigate: circum (around) nav (sail) ate (make, cause) Lesson 1

5. 5. De ~> down Demote: de (down) mot (move) Descend: de (down) scend (climb) Decline: de (down) clin (bend) Lesson 1

6. 6. Dis (di, dif) ~> apart, away, not Divert: di (away) vert (turn) Differ: dif (away) fer (carry) Disrupt: dis (away) rupt (break) Lesson 1

7. 7. Endo ~> inside, within Endoderm: endo (within) derm (skin) Endocardium: endo (inside) cardi (heart) ium (condition, place) Endocrine: endo (inside) krin (separate) Lesson 1

8. 8. Exo ~> outside Exocrine: exo (outside) krin (separate) Exotic: exo (outside) ic (having characteristics of) Exosphere: exo (outside) sphere (sphere) Lesson 1

9. 9. Extra (extro) ~> beyond Extraordinary: extra (beyond) ordin (order) ary (place where) Extrasensory: extra (beyond) sens (feel) ory (having characteristics of) Extraterrestrial: extra (beyond) terrestri (earth) al (related to) Lesson 1

10. 10. Hetero ~> different Heterogeneous: hetero (different) gen (kind) ous (full of) Heteromorphic: hetero (different) morph (shape) ic (having characteristics of) Heterosexual: hetero (different) sex (sex) al (related to) Lesson 1

11. 11. Homo ~> same Homonym: homo (same) onym (name) Homogeneous: homo (same) gen (kind) ous (full of) Homophone: homo (same) phon (sound) Lesson 1

12. 12. In (il, im, ir) ~> in, into Inject: in (in, into) ject (throw) Illuminate: il (in) lumin (light) ate (make, cause) Import: im (in) port (carry) Irrigate: ir (in) rigar (water) ate (make, cause) Lesson 1

13. 13. In (ig, il, im, ir) ~> not Inactive: in (not) act (act, do) ive (have power) Ignoble: ig (not) nobilis (noble) Illegal: il (not) leg (law) al (related to) Irrational: ir (not) ration (reason) al (related to) Lesson 1

14. 14. Inter ~> between, among Interact: inter (between) act (act, do) Interrupt: inter (between) rupt (break) Intervene: inter (between) vene (come) Lesson 1

15. 15. Intra (intro) ~> inside, within Intravenous: intra (inside) ven (vein) ous (full of) Introduce: intro (inside) duc (lead) Introspect: intro (inside) spect (look) Lesson 1

16. 16. Iso ~> same Isometric: iso (same) metr (measure) ic (related to) Isosceles: iso (same) skelos (leg) Isothermal: iso (same) therm (heat) al (related to) Lesson 1

17. 17. Macro ~> large, great Macroscopic: macro (large) scop (look, see) ic (having characteristics of) Macrocosm: macro (large) cosm (world, universe) Macrocyte: macro (large) cyte (cell) Lesson 1

18. 18. Micro ~> small Microscopic: micro (small) scop (look, see) ic (having characteristics of) Microcosm: micro (small) cosm (world, universe) Microcyte: micro (small) cyte (cell) Lesson 1

19. 19. Medi ~> middle Median: medi (middle) an (related to) Medieval: medi (middle) ev (time, age) al (related to) Medium: medi (middle) ium (state, condition) Lesson 1

20. 20. Per ~> through, thoroughly Perspire: per (through) spir (breathe) Permit: per (through) mit (send) Perennial: per (through) enn (year) al (related to) Lesson 1

21. 21. Pre ~> before Prefix: pre (before) fix (place, put) Precede: pre (before) ced (go) Prevent: pre (before) ven (come) Lesson 1

22. 22. Post ~> after Postpone: post (after) pon (place, put) Postscript: post (after) script (write) Postmeridian: post (after) meridian (midday) Lesson 1

23. 23. Se ~> apart, away Secede: se (apart) ced (go) Seclude: se (away) clud (close, shut) Seduce: se (away) duc (lead) Lesson 1

24. 24. Syn (syl, sym, sys) ~> same, together, with Synonym: syn (same) onym (name) Symphony: sym (together) phon (sound) y (result of) Syllable: syl (together) lambanein (take) Lesson 1

25. 25. Ultra ~> beyond Ultraliberal: ultra (beyond) liber (free) al (related to) Ultramodern: ultra (beyond) mod (now) ern (related to) Ultrasound: ultra (beyond) son (sound) Lesson 1