CMP WEEK-19 (SAT Vocabulary)

to legally certify

incorrect; mistaken

a sharp taste; acrid 

happening at the exact same time

a rule of action; a principle to live by

impossible to retract or revoke

a face or facial expression

a strong, stimulating taste

a problem or predicament with no obvious resolution

to break a promise or obligation; revoke

of little importance; insignificant

ability to discern or discriminate; shrewdness

one who excels in a difficult field at an early age

having a bad, offensive odor

the use of single atoms & molecules to make microscopic devices