f- af-fix to fix _to_.
ag- ag-grieve to give pain _to_.
al- = _to_ al-ly to bind _to_.
an- an-nex to tie _to_.
ap- ap-pend to hang _to_.
ar- ar-rive to reach _to_.
as- as-sent to yield _to_.

NOTE.--The forms AC-, AF-, etc., are euphonic variations of AD-, and follow
generally the rule that the final consonant of the prefix assimilates to
the initial letter of the root.

AM- = _around_ am-putate to cut _around_.
amb- amb-ient going _around_.

ANTE- = _before_ ante-cedent going _before_.
anti- anti-cipate to take _before_.

BI- = _two_ or bi-ped a _two_-footed animal.
bis- _twice_ bis-cuit _twice_ cooked.

CIRCUM- = _around_ circum-navigate to sail _around_.
circu- circu-it journey _around_.

CON- con-vene to come _together_.
co- co-equal equal _with_.
co- = _with_ or co-gnate born _together_.
col- _together_ col-loquy a speaking _with_ another.
com- com-pose to put _together_.
cor- cor-relative relative _with_.

NOTE.--The forms CO-, COL-, COM-, and COR-, are euphonic variations of
CON-.

CONTRA- contra-dict to speak _against_
contro- = _against_ contro-vert to turn _against_
counter- counter-mand to order _against_

DE- = _down_ or de-pose; to put _down_;
_off_ de-fend fend _off_.

DIS- _asunder_ dis-pel to drive _asunder_.
di- = _apart_ di-vert to turn _apart_.
dif- _opposite of_ dif-fer 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- ex-clude to shut _out_.
e- = _out_ or e-ject to cast _out_.
ec- _from_ ec-centric