A single dose is a measured amount of medication or other substance that is intended to be taken in one go. The term can also refer to a single serving of food or drink. In crossword puzzles, the solutions for the term 'single dose' are DAT (3 letters) and UNIT (4 letters). DAT stands for 'drug administration time, ' which is the time at which a drug should be taken. UNIT stands for 'UNIT dose, ' which is a single dose of medication packaged in a UNIT-of-use container.