Dot  —n. 1 a small spot or mark. B this as part of i or j, or as a decimal point etc. 2 shorter signal of the two in morse code. —v. (-tt-) 1 a mark with dot(s). B place a dot over (a letter). 2 (often foll. By about) scatter like dots. 3 partly cover as with dots (sea dotted with ships). 4 slang hit.  dot the i's and cross the t's colloq. 1 be minutely accurate. 2 add the final touches to a task etc. On the dot exactly on time. The year dot colloq. Far in the past. [old english]