GRE : Essential Latin Roots : Con-, Com-

collusion
noun
secret agreement, esp. for fraudulent or treacherous purposes
 
combustion
noun
process of burning
 
commemorate
verb
serve as a memorial or reminder of
 
commodious
adjective
spacious and convenient
 
commuter
noun
person who commutes, esp. between home and work
 
complaisance
noun
quality of being complaisant
 
compunction
noun
feeling of uneasiness of the conscience caused by regret for doing wrong
 
conceal
verb
withdraw or remove from observation
 
conceit
noun
excessively favorable opinion of one's own ability, importance, or wit
 
conciliatory
adjective
tending to conciliate
 
concord
noun
agreement between persons, groups, nations
 
concur
verb
accord in opinion
 
condense
verb
make more dense or compact
 
condone
verb
disregard or overlook
 
congeal
verb
change from a soft or fluid state to a rigid or solid state
 
conjoin
verb
join together
 
connoisseur
noun
person who is especially competent to pass critical judgments in an art
 
connotation
noun
instance of connoting
 
consequential
adjective
following as an effect, result, or outcome
 
console
verb
alleviate or lessen the grief, sorrow, or disappointment of
 
conspicuous
adjective
easily seen or noticed
 
consternation
noun
sudden, alarming amazement or dread that results in utter confusion
 
constrain
verb
force, compel, or oblige
 
constrict
verb
draw or press in
 
consume
verb
destroy or expend by use
 
consummate
verb
bring to a state of perfection
 
contemn
verb
treat or regard with disdain, scorn, or contempt
 
contentious
adjective
tending to argument or strife
 
contiguous
adjective
touching
 
contrite
adjective
caused by or showing sincere remorse
 
contumacious
adjective
stubbornly perverse or rebellious
 
conundrum
noun
riddle, the answer to which involves a pun or play on words
 
conviction
noun
fixed or firm belief
 
convoke
verb
call together
 
convoluted
adjective
twisted