90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
as an adverb (with a verb): I immediately recognized his voice. (followed by a preposition or another adverb): She's the woman who was standing immediately next to me. ♦ Our team scored another goal almost immediately afterwards. (followed by an adjective): It was immediately obvious that there was some kind of problem.
as a conjunction (connecting two clauses) in British English: I'll phone you immediately I hear any news.