Text Input software built into some cell phones and mobile devices that makes typing words on a keypad easier. Instead of pressing each key one, two or three times, just to press it once and a built-in vocabulary will attempt to guess the word that you are spelling. Using this system, SMS messages and sometimes e-mails are quicker and easier to write. Often referred to as T9, the most popular type of predictive text entry. The competitor to T9 is iTAP by Motorola.