We use oh as a discourse marker to respond to new information or to show that we have just discovered something surprising. We often use it with other discourse markers: …, With a population of nearly 11.9 million, Ohio is the seventh-most populous and tenth-most densely populated state. Its capital and most populous city is Columbus, with other major metropolitan centers including Cleveland and Cincinnati, as well as Dayton, Akron, and Toledo., How Do You Spell Oh Correctly? You should always spell “oh” with an “o” and an “h” – not to be confused with the letter “o” by itself, which we will discuss next., oh (oʊ) interj., n., pl. oh's, ohs, interj. 1. (used as an exclamation of surprise, pain, disapprobation, sympathy, agreement, etc.), Master the word "OH" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource., oh /oʊ/ interj., n., pl. oh's, ohs. (used to express surprise, pain, disapproval, sympathy, agreement, and other emotions): Oh! What's that noise? (used when speaking to another to attract that person's attention): Oh, waiter! (used when the speaker is hesitating, thinking, guessing, etc.: The fish must have weighed, oh, six or seven pounds..