In online math dictionary you will find the meaning of all the mathematical word. If the student during any explanation doesn’t understand a particular word he/she can always take the help of the dictionary. Parents and teachers can also take the help of the dictionary to explain your children.

**Abacus**

An oriental device used for counting and calculating.**Abelian group**

A group in which the binary operation is commutative or satisfies the commutative law,that is,xy = yx for all elements x and y in the group.**Abscissa**

In a 2-dimensional coordinate system the horizontal value of x in a pair of coordinates

**Absolute value **

The numerical value of a real number, disregarding the sign. For example, |2|=2, |-3|=3, and |0|=0.

**Abundant number **

A perfect integer that is greater than the sum of all its proper factors, including 1.

A tangent that passes through the three vertices of a triangle is known as the circumcircle of the triangle.

In a the circumcircle of the triangle the centre of the circle is located at the point of intersection of the perpendicular bisectors of the sides of the triangle. This point is known as the circumcentre of the triangle.

A common tangent is called a direct common tangent if both the circles lie on the same side of it.

**Any number divisible by 2 is an even number.**

Out of the total results obtained from a certain experiment, the set of those results which are in favor of a definite result is called the event and it is denoted as E.

A number is formed by grouping the digits together.

The face value of a digit for any place in the given number is the value of the digit itself.

The circle that lies inside a triangle and touches all the three sides of the triangle is known as the incircle of the triangle.

In the Incircle of a triangle the centre of the circle is located at the point of intersection of the internal bisectors of the angles of the triangle. This point is called the incentre of the triangle.

If the data are arranged in ascending or descending order then the variate lying at the middle between the lowest variates and the median is called the lower quartile (or the first quartile), and it is denoted by Q_{1}.

Median is another measure of central tendency of a distribution. If the observations (variates) are arranged in ascending or descending order then the variate in the middle is called the median of the distribution.

Thus, the median divides the ordered observations in two equal halves.

A matrix is a rectangular arrangement or array of numbers or functions, in the form of horizontal and vertical lines and subject to certain rules of operations.

Numbers which are not exactly divisible by 2 are called odd numbers. Or, we can say that, the number which is not even or not divisible by 2 is called an odd number.

The concept of probability started in a statistical form of collecting data and it was called Empirical Probability. Later a theoretical approach was introduced for probability and it was called Theoretical Probability or Classical Probability.

A number is formed by grouping the digits together.

Each digit has a value depending on its place called the place value of the digit.

Place value of a digit = (face value of the digit) × (value of the place)

The three variates which divide the data of a distribution in four equal parts (quarters) are called quartiles. As such, the median is the second quartile.

If an experiment, although conducted under identical conditions, can result in two or more known outcomes, it is called a random experiment.

A common tangent is called a transverse common tangent if the circles lie on opposite sides of it.

The process of conducting an experiment is called a trial which results in any one of the possible outcomes.

**If the data are arranged in ascending or descending order then the variate lying at the middle between the largest and the median is called the upper quartile (or the third quartile), and it denoted by** Q_{3}.

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