The vast realm of mathematics is more than just numbers; it’s a language all on its own, brimming with unique terminologies that lay the foundation for understanding complex concepts.

To intrigue and enlighten you further, let’s explore some key math terms that kick off with the letter ‘I’.

Let’s illuminate these mathematical wonders!

1. Integer: A whole number, positive or negative, including zero.
2. Integral: Concerning integrals; it’s the reverse of differentiation, representing the area under a curve.
3. Intercept: The point where a line or curve crosses an axis.
4. Interpolation: A method of estimating values between two known values.
5. Isosceles: A triangle with two sides of equal length.
6. Irrational Number: A number that cannot be expressed as a ratio of two integers, like the square root of 2 or π.
7. Inverse: Opposite in effect. The inverse of adding 9 is subtracting 9.
8. Identity: In algebra, an equation that’s true for every value of its variable. Like a(a^2 – b^2) = a^3 – ab^2.
9. Infinity: A concept describing something without any limit or boundless.
10. Imaginary Number: A complex number which can be written as a real number multiplied by the imaginary unit ‘i’, which is the square root of -1.
11. Inequality: A mathematical statement indicating that two quantities are not equal.
12. Indeterminate: An expression with no defined value or an unknown quantity.
13. Inscribed: Drawn or written on something. For instance, an inscribed angle is an angle with its vertex on a circle’s circumference.
14. Iterative: A process that repeats, generally aiming to come closer to a solution with each repetition.
15. Isometry: A transformation preserving distances.
16. Invariant: Not changing under a set of transformations.
17. Inversely Proportional: When one quantity increases while another quantity decreases at the same rate.
18. Index: Typically refers to the power or exponent to which a base is raised.
19. Induction: A method of mathematical proof, especially used in number theory.
20. Interval: A set of real numbers with the property that any number that lies between two numbers in the set is also included in the set.

While some of these terms might seem intimidating initially, they are integral (pun intended) to understanding many mathematical concepts.

These ‘I’ terms are just a sliver of the vast mathematical lexicon out there.

So keep exploring, and you’ll be infinitely (another pun!) surprised at what you might discover. Keep your curiosity insatiable!