ANTI means
Against
Bilateral means
(Decision) evolving two parties
SUB means
Under
Semiformal means
Half formal event
Interstate means
CIRCUM means
Around
Composure means
Holding oneself together
PRE means
Before
Predict means
To know something will happen before it happens
Nonprofit means
Company not focused on/making a profit
DE means
Down
Equilateral means
Something with equal sides
NON means
Not
Misfortune means
Introvert means
A person withdrawn into themselves
DIS means
Away/apart
Conjunction means
Word(s) connecting other words/phrases together
INTRO means
Into
Postgraduate means
Classes/study done after undergraduate school
Premeditated means
Action thought-out beforehand
EQUI means
Equal
Extraterrestrial means
Something beyond the earth/atmosphere
INTRA means
Within
Intravenous means
Something within the veins
Subterranean means
Anything under the earth's surface