Longman Dictionary of Contemporary English - dot

~1 n 1 a small round mark or spot 2 on the dot informal exactly at a particular time  (on the dot of five (o'clock)/at five (o'clock) on the dot)  (Mr Green arrived at six on the dot.) 3 something that looks like a small spot because it is so far away  (The plane was just a dot in the sky.) 4 a short sound or flash of light used when sending messages by morse code  (- compare dash2, - see also the year dot year (11)) ~2 v dotted, dotting 1 to mark something by putting a dot on it or above it  (She never dots her i's.) 2 often passive to spread things over a wide area and quite far apart  (be dotted with)  (The lake was dotted with sailboats. | be dotted about/around etc)  (The company now has over 20 stores dotted around the country.) 3 to put a very small amount of something on a surface or in several places on a surface  (Dot some rouge on your cheeks, then blend carefully.) 4 dot the i's and cross the t's informal to pay attention to all the details when you are finishing something  (Well, we haven't dotted the i's and crossed the t's, but the contract's nearly ready.)  (- see also dotted line)