Rational is the opposite of irrational. The ir- prefix is a variation of the in- prefix and means "not".
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A synonym is a word that means the same. An antonym is a word that means the opposite. A projection is a part that sticks out. A recess is a part that goes inward. These two words are opposites.
No. Irrational means "not rational". A number either is rational, or it is not rational - tercium non datur.
NO. The word irrational means "cannot be expressed as a ratio". A fraction IS a ratio. For instance: in the ratio 1:3 , the total number of shares is 4(=1+3). The share 1 is 1/4 of the total. Since a fraction is a ratio, it is WRONG to say it is irrational, which would mean it is not a fraction (or ratio). However, it is also good to take note that even an irrational number is a real number.
It means that it is an exponent, and that it is not a rational number - i.e., one that can be written as a fraction of two integers.
Inverse means opposite or reversing. An example sentence would be: They are perfect for each other because she is the inverse of him.