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What imaginary number means in math is: "the square root of minus 1"

Which is true but confusing, so

All "real" numbers lie in a straight line from minus very large, through zero, to plus very large.

Now draw that line on a sheet of paper (don't worry about the fact that the line theoretically goes way beyond the paper).

See all the white space left ?

That's where "imaginary" numbers all fit.

"imaginary" is just a word they use for those numbers that exist in more than one dimensional space.

Q: What does imaginary number mean in math?

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The only thing I can think of that you might mean is an imaginary or complex number. Since there is no solution to √(-1) mathematicians labeled it as i which is the imaginary number, and any number that includes purely i is also imaginary. Complex numbers are a mix of both real and imaginary numbers. for example 3 is real, 5i is imaginary and 3+5i is complex. Hopefully this answers what you meant.

Any number, real or imaginary, can be the sum of another number plus 9.

"i" is the square root of -1. Since there is no real number whose square is negative, i is an imaginary number.

In math, j is the imaginary number that is the square root of positive one, but is not equal to one.

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The only thing I can think of that you might mean is an imaginary or complex number. Since there is no solution to √(-1) mathematicians labeled it as i which is the imaginary number, and any number that includes purely i is also imaginary. Complex numbers are a mix of both real and imaginary numbers. for example 3 is real, 5i is imaginary and 3+5i is complex. Hopefully this answers what you meant.

That probably refers either to an imaginary number, or to a complex number. Despite the weird name, the "imaginary numbers" (and the complex numbers) have many uses in math and science.

Any number, real or imaginary, can be the sum of another number plus 9.

"i" is the square root of -1. Since there is no real number whose square is negative, i is an imaginary number.

In math, j is the imaginary number that is the square root of positive one, but is not equal to one.

The number one always means the same thing, at any size font. However, you may be thinking of the letter i. That is used to mean an imaginary number defined as the square root of minus one.

'i' is often used to represent the imaginary part of a complex number, and is equal to the square root of -1.

Iota is a imaginary part.

Yes. The number 1 + i is imaginary but not pure imaginary, while 5i is pure imaginary.

It could be an imaginary number or a complex number or on belonging to a higher class of numbers.

The square root of negative 64 isn't even a real number. In math and engineering, it's called an "imaginary number".