Other forms: punctuated; punctuating; punctuates
Most commonly, punctuate means to insert standard marks (like periods, commas, and exclamation points) into written sentences.
You punctuate sentences to give the reader additional information, such as when a sentence ends, whether or not that sentence is a question, and when a series of words might be a list. You can also punctuate, or emphasize, your words by shouting them or making them ALL CAPS. Occasionally, this verb can also mean "interrupt periodically," as when your cat walks back and forth across your keyboard, punctuating your writing with "shjkpl;" and "pohjxz."