Our Math Dictionary words that start with M have definitions and links to our other pages. We have the most comprehensive list of elementary school Math definitions for words that we have seen. Enjoy!
Main Diagonal - in the matrix [aij], the elements a11, a22, ..., ann.
Major Axis - the major axis of an ellipse is it’s longest chord.
Malfatti Circles - three equal circles that are mutually tangent and each tangent to two sides of a given triangle.
Mandelbrot Set - generated by taking the set of all functions f(Z)=Z^2+C, looking at all of the possible C points and their Julia sets, and assigning colors to the points based on whether the Julia set is connected or dust.
Matrix - a rectangular array of elements.
Maximum - the largest of a set of values.
Mean - the sum of a list of numbers, divided by the total number of numbers in the list.
Medial Triangle - the triangle whose vertices are the midpoints of the sides of a given triangle.
Median - the median of a triangle is the line from a vertex to the midpoint of the opposite side.
Median - when a set of numbers is ordered from smallest to largest, the median number is the one in the middle of the list.
Mensuration - that branch of mathematics which treats of the measurements of lines surfaces and solids.
Mersenne Number - a number of the form 2p-1 where p is a prime.
Mersenne Prime - a number that is prime.
Metric System - a series of measures whose units are derived from a fixed standard called the meter.
Midnight - 12:00 a.m.
Midpoint - the point M is the midpoint of line segment AB if AM=MB. That is, M is halfway between A and B.
Midpoint Formula - the exact point that’s in the middle.
Milligram - one 1000th of a gram.
Milliliter - one 1000th of a liter.
Millimeter - one 1000th of a meter.
Millisecond - one 1000th of a second.
Minimum - the smallest of a set of values.
Minor Axis - the smallest chord of an ellipse.
Minuend - the number you are subtracting from. The minuend minus the subtrahend equals the difference, or remainder.
Minus sign - the dash symbol - used to indicate that one number is to be subtracted from another.
Mixed Numbers - numbers that have both whole numbers and decimals, or whole numbers and fractions.
Mode - the most frequently occurring value in a sequence of numbers.
Modular Arithmetic - a method for finding remainders where all the possible numbers (the numbers less than the divisor) are put in a circle, and then by counting around the circle the number of times of the number being divided, the remainder will be the final number landed on.
Modulo - the integers a and b are said to be congruent modulo m if a-b is divisible by m.
Modulus - a unit of measure.
Monic Polynomial - a polynomial in which the coefficient of the term of highest degree is 1.
Mono - one.
Monochromatic Triangle - a triangle whose vertices are all colored the same.
Monomial - an algebraic expression consisting of just one term.
Monotone - a sequence the terms of which are not increasing or decreasing.
Multimodal Distribution - a distribution with more than one mode.
Multinomial - an algebraic expression consisting of 2 or more terms.
Multiple - a number that is the product of a given number and some other number.
Multiples - the product of multiplying a number by a whole number.
Multiplicand - a number to be multiplied by another. Factor x factor = Product where the first factor is also called a multiplicand.
Multiplication - the basic arithmetical operation of repeated addition.
Multiplication Rule - the probability that events A and B both occur (i.e., that event AB occurs), is equal to the conditional probability that A occurs given that B occurs, times the unconditional probability that B occurs: P(A & B)=P(A/B)*P(B).
Multiplication sign - usually the symbol x, sometimes a suspended dot (not used with decimal figures), placing numbers in parentheses nest to each other (3)(2)=6. Also placing variables next to each other 4xyz means 4 times the value of x times the value of y.
Multiplicative Inverse - the number that when multiplied by the original number will result in a product of one.
Multiplier - the number which is multiplied times the multiplicand. Factor x factor = Product where the second factor is also called a multiplier.
I keep these definitions as a glossary in my binder.