Dose (noun)

1. A measured amount of medicine or drug taken at a particular time.
2. A measured quantity of something, especially something harmful or unpleasant, given or inflicted at a particular time.

Origin:

From old english dæse, from latin dosis ("dose, portion"), from greek δόσις (dósis, "a giving, a portion").

Examples:

1. The recommended dose of the medication is one tablet per day.
2. He took a dose of cough syrup.
3. She gave the patient a dose of antibiotics.
4. The dose of radiation was too high.
5. The dose of humor in the movie was perfect.