Definition/Meaning  Word/Phrase 
number that divides exactly into another number 
aliquot

something that exactly succeeds in achieving its goal 
bell ringer
,
bull's eye
,
home run
,
mark

speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second 
c
,
light speed
,
speed of light

contrapuntal piece of music in which a melody in one part is imitated exactly in other parts 
canon

geometric figures coinciding exactly 
congruent

one of two or more integers that can be exactly divided into another integer 
divisor
,
factor

copy that corresponds to an original exactly 
duplicate
,
duplication

operation on exactly two operands 
dyadic operation

division of the scale based on an octave that is divided into twelve exactly equal semitones 
equal temperament

side exactly equal to others 
equilateral

number which can be divided exactly 
factor

smallest multiple that is exactly divisible by every member of a set of numbers 
lcm
,
least common multiple
,
lowest common multiple

something exactly like or corresponding to another 
match

operation with exactly one operand 
monadic operation
,
unary operation

exactly right 
on target

get exactly right 
peg

in some classifications nearly or exactly equivalent to the Perciformes which are considered a suborder 
Percoidea
,
suborder Percoidea

exactly upright 
perpendicular

balance exactly 
poise

prime factors of a quantity are all of the prime quantities that will exactly divide the given quantity 
prime factor
