By definition, pi is the ratio of the circumference of a circle to its diameter. Pi is always the same number, no matter which circle you use to compute it. For the sake of usefulness people often need to approximate pi.
Definition and Examples of Literary Terms. The term palindrome is derived from two Greek words âpalinâ means again and âdromosâ means way or direction. It is defined as a number, a word, a sentence, a symbol or even signs that can be read forward as well as backward or in reserve order with the same effects and meanings.
The word comes from the Greek words palin (meaning again) and dromos (meaning direction.) Examples include: Hannah, race car, and civic. Words that are spelled the same when read forwards or backwards are called palindromes. See the 'related links' below for a great selection of palindromes.