Prefixes
Prefix / Meaning / Key Word(s)1. / a-, ab-, abs- / away, from / absent, abstinence
2. / ad-, a-, ac-, af-, ag-, ar-, at- as- / to, toward / adhere, annex, accede, adapt
3. / anti- / against / antifreeze, antisocial
4. / bi-, bis / two / bicycle, biped, bisect
5. / circum- / around / circumference
6. / com-, con / together, with / combination, connect
7. / de- / opposite, away, from / detract, defer, demerit, defrost
8. / dis-, dif-, di- / apart, not / disperse, different
9. / en-, em- / cause to / encode, embrace
10. / epi- / upon, on top of / epicenter
11. / equi- / equal / equality, equitable
12. / ex-, e- / out, from, forth / eject, exhale, exit
13. / fore- / before / forecast
14. / hyper- / over, above / hyperactive, hypersensitive
15. / hypo- / under, beneath / hypodermic
16. / in-, im- / in / infield
17. / in-,im- il- ir- / not / injustice, impossible
18. / inter- / between / interact, intercede
19. / mal-, male- / bad, ill / malpractice, malevolent
20. / mid- / middle / midway
21. / mis- / wrong / mistake, misunderstand
22. / mono- / alone, single, one / monotone, monopoly
23. / non- / not / nonsense
24. / ob- / in front of, against / obvious
25. / omni- / everywhere, all / omnipresent
26. / over- / over / overlook
27. / pre- / before / prefix, predawn
28. / preter- / past, beyond / preternatural
29. / pro- / forward / proceed, promote
30. / re- / again, back / return, recall, recede
31. / retro- / backward, behind, back / retroactive
32. / se- / apart / secede
33. / semi- / half / semicircle
34. / sub- / under / submarine, subway
35. / super- / greater, beyond / supernatural, superstition
36. / trans- / across, beyond / transport, transcend, transcontinental
37. / uni- / one / unilateral, unity
38. / un- / not / unhappy, unethical
39. / under- / under / undersea