1. A small diacritic mark; such as, an accent, vowel mark, or dot over an i.
2. A small mark used in printing and writing; for example, an accent, a punctuation mark, a diacritical mark; or an umlaut (¨; ä, ö, ü that shows that it is pronounced in a particular way) or a cedilla (a mark under the letter c in some languages; such as, French and Portuguese, which shows that ç has the sound of the letter s, and not k).
3. A very small part or quantity; a particle, jot, the tiniest bit, an iota, or whit: "She said she didn't care a tittle what he wants to do."
4. Etymology: from the late 14th century, "a small stroke" or "point in writing" representing Latin apex in the Late Latin sense of "accent mark over a vowel", borrowed possibly by the influence of Provençal (a Romance language of several dialects in southern France) titule, "the dot over -i-" from Latin titulus, "inscription, heading".

Talking about other people's lives which is usually unkind or not true: "They know that tittle-tattle about the movie star helps to sell newspapers."