| NOUN | quantity | real number, real | any rational or irrational number |
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| Meaning | Any rational or irrational number. | |
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| Synonym | real | |
| Narrower | irrational number, irrational | A real number that cannot be expressed as a rational number |
| rational number, rational | An integer or a fraction | |
| scalar product, inner product, dot product | A real number (a scalar) that is the product of two vectors | |
| Broader | complex number, complex quantity, imaginary number, imaginary | (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1 |