Math Glossary Letter O obtuse angle noun angle measuring greater than 90 degrees obtuse triangle noun A triangle which has an obtuse angle as one of its interior angles. octagon noun An eight (8) sided polygonP = 8s octal noun base 8 number system odd number noun a whole number that is not able to be divided by two into two equal whole numbers odd numbers noun Numbers not divisible by 2 odds noun The ratio of a payoff to a stake odds probability noun Probability of odds paying off odds ratio noun a measure of association between an exposure and an outcome odious numbers noun A number with an odd number of 1s in the binary expansion ohm noun unit of electrical resistance in the International System of Units ohms law noun the current through a conductor between two points is directly proportional to the voltage across the two pointsV = IR omega noun A letter of the greek alphabet used for math notation.Ω ω= omicron noun A letter of the greek alphabet used for math notation.Ο ο open interval noun Interval with no endpoints(a,b) open sentences noun A math statement, either true or false, based on values supplied for a variable operation noun A math process operator noun any symbol that indicates an operation to be performed such as addition, subtraction, multiplication, division opportunity cost noun the loss of potential gain from other alternatives when one alternative is chosen. opposite noun diametrically different; of a contrary kind. opposite numbers noun A number on the other side of the number line, with the same distance from zero option noun a contract which conveys to its owner, the holder, the right, but not the obligation, to buy or sell a specific quantity of an underlying asset or instrument at a specified strike price on or before a specified date option delta noun the theoretical estimate of how much an option's value may change given a $1 move UP or DOWN in the underlying security order noun a position, rank or arrangement of numbers or objects order of a matrix noun Number of rows times number of columns,m x n order of magnitude noun An order-of-magnitude difference between two values is a factor of 10N = a * 102 order of operations noun a collection of rules that reflect conventions about which procedures to perform first in order to evaluate a given mathematical expressionPEDMAS - Parentheses, Exponents, Division, Multiplication, Addition, Subtraction ordered pair noun A pair of numbers signifying the location of a point(x, y) ordered partitions noun a list of pairwise disjoint nonempty subsets of s such that the union of these subsets is s. ordered triple noun Three numbers signifying the location of a point in 3-D space(x, y, z) ordering fractions noun Sorting a fraction set ascending or descending ordering numbers noun Sorting a number set ascending or descending ordinal noun a number such as 1st, 2nd, 3rd, 4th, that shows the position of something in a list of things1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th ordinate noun Absolute value of the y-coordinate, or perpendicular distance to the x-axis. For the cartesian coordinates (x, y), the abscissa is |y|. ordinate noun The y-coordinate in any point on the Cartesian graph(x, y) origin noun On a two digit coordinate plane, the point (0, 0), where the x-axis and y-axis cross. orthocenter noun The point where the three altitudes of a triangle intersect orthogonal noun Two perpendicular lines - two lines forming a 90 degree angle ounce noun A unit of measurement for liquids/solids outcome noun a possible result of an experiment or trial outer fence noun start with the IQR and multiply this number by 3. We then subtract this number from the first quartile and add it to the third quartile. These two numbers are our outer fences. outlier noun an observation that lies an abnormal distance from other values in a random sample from a population output noun what comes out of a function overtime noun Hours worked over the standard 40 hour workweek