| ob- o- oc- of- op- | in the way, = against, or out | ob-ject o-mit oc-cur of-fend op-pose | to throw against. to leave out. to run against; hence, to happen. to strike against. to put one's self against. |
| per- pel- | = through, thoroughly | per-vade; per-fect pel-lucid | to pass through; thoroughly made. thoroughly clear. |
NOTE.—Standing alone, per- signifies by: as, per annum, by the year.
| post- | = after, behind | post-script | written after. |
| pre- | = before | pre-cede | to go before. |
| preter- | = beyond | preter-natural | beyond nature. |
| pro | for, = forth, or forward | pro-noun pro-pose | for a noun. to put forth. |
NOTE.—In a few instances pro- is changed into pur-, as purpose; into por-, as portray; and into pol-, as pollute.
| re- red- | = back or anew | re-pel red-eem | to drive back. to buy back. |
| retro- | = backwards | retro-grade | going backwards. |
| se- | = aside, apart | se-cede | to go apart. |
| sine- | = without | sine-cure | without care. |
| sub- suc- suf- sug- sum- sup- sus- | = under or after | sub-scribe suc-ceed suf-fer sug-gest sum-mon sup-port sus-tain | to write under. to follow after. to undergo. to bring to mind from under. to hint from under. to bear by being under. to under-hold. |
NOTE.—The euphonic variations suc-, suf-, sug-, sum-, sup-, result from assimilating the b of sub- to the initial letter of the root. In "sustain" sus- is a contraction of subs- for sub-.
| subter- | = under or beneath | subter-fuge | a flying under. |
| super- | = above or over | super-natural super-vise | above nature. to over-see. |
NOTE.—In derivatives through the French, super- takes the form sur-, as sur-vey, to look over.
| trans- tra- | through, = over, or beyond | trans-gress tra-verse | to step beyond. to pass over. |
| ultra- | = beyond, or extremely | ultra-montane ultra-conservative | beyond the mountain (the Alps). extremely conservative. |