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A polynomial which contains only one non-zero single term is called a monomial. A monomial consists either one variable or a constant or products of more than one variable with a coefficient along with the exponents as a whole numbers.

Note: A monomial cannot have a variable in the denominator. The variable in the denominator is considered as second term.

The different parts of the monomial expression are given as follows:

Coefficient:The number which is multiplied by the variable in the expression.

Variable: The alphabets present in the monomial expression are called as variables

Literal part: All the other parts except the coefficient, are called the literal part of the expression.

Degree:The sum of the powers of the variables in the expression is the degree of the expression.

Example:$5a^2{b}^3$is a monomial expression.

Here,see that the coefficient is 5.

Variables in the given expression are a andb.

$$\begin{gathered} \text{¶Ù±ð²µ°ù±ð±ð â¶Ä‰o´Ú â¶Ä‰t³ó±ð â¶Ä³¾´Ç²Ô´Ç³¾¾±²¹±ô â¶Ä‰e³æ±è°ù±ð²õ²õ¾±´Ç²Ô}=\text{ d±ð²µ°ù±ð±ð â¶Ä‰o´Ú â¶Ä‰}a+\text{»å±ð²µ°ù±ð±ð â¶Ä‰o´Ú â¶Ä‰}b \\ =2+3 \\ =5 \end{gathered}$$

The literal part of the expression is $a^2{b}^3$.

From the definition, a monomial expression must contain only one non-zero term.

The expression$\frac{−2g}{4h}$contains a variable h in the denominator. By the definition of monomial, there must not be any variable in the denominator. The variable in the denominator is considered as a second term.

Therefore$\frac{−2g}{4h}$has two terms.

Hence, $\frac{−2g}{4h}$is not a monomial expression.