| am- amb- | = around | am-putate amb-ient | to cut around. going around. |
| ante- anti- | = before | ante-cedent anti-cipate | going before. to take before. |
| bi- bis- | = two or twice | bi-ped bis-cuit | a two-footed animal. twice cooked. |
| circum- circu- | = around | circum-navigate circu-it | to sail around. journey around. |
| con- co- co- col- com- cor- | = with or together | con-vene co-equal co-gnate col-loquy com-pose cor-relative | to come together. equal with. born together. a speaking with another. to put together. relative with. |
NOTE.—The forms co-, col-, com-, and cor-, are euphonic variations of con-.
| contra- contro- counter- | = against | contra-dict contro-vert counter-mand | to speak against to turn against to order against |
| de- | = down or off | de-pose; de-fend | to put down; fend off. |
| dis- di- dif- | asunder = apart opposite of | dis-pel di-vert dif-fer | to drive asunder. to turn apart. to bear apart; disagree. |
NOTE.—The forms di- and dif- are euphonic forms of dis-; dif- is used before a root beginning with a vowel.
| ex- e- ec- ef- | = out or from | ex-clude e-ject ec-centric ef-flux | to shut out. to cast out. from the center. a flowing out. |
NOTE.—e-, ec-, and ef- are euphonic variations of ex-. When prefixed to the name of an office, ex- denotes that the person formerly held the office named: as, ex-mayor, the former mayor.
| extra- | = beyond | extra-ordinary | beyond ordinary. |
| in- il- im- ir- en-, em- | (in nouns and verbs) = in, into, on | in-clude il-luminate im-port ir-rigate en-force | to shut in. to throw light on. to carry in. to pour water on. to force on. |
NOTE.—The forms il-, im-, and ir- are euphonic variations of in-. The forms en- and em- are of French origin.
| in- i(n) il- im- ir- | (in adjectives and nouns.) = not | in-sane i-gnoble il-legal im-mature ir-regular | not sane. not noble. not legal. not mature. not regular. |
| inter- intel- | = between or among | inter-cede intel-ligent | to go between. choosing between. |
| intra- | = inside of | intra-mural | inside of the walls. |
| intro- | = within, into | intro-duce | to lead into |
| juxta- | = near | juxta-position | a placing near |
| non- | = not | non-combatant | not fighting. |
NOTE.—A hyphen is generally, though not always, placed between non- and the root.