The crossword solutions for the term BRIEFLY, BRIEFLY are 'abbr, ' which is an ABBREVIATION for the word 'ABBREVIATION.' BRIEFLY is an adverb that means 'in a short time' or 'for a short time.' It is often used to describe something that happened quickly or was done quickly. Abbreviations are shortened forms of words or phrases that are used to save time and space when writing or speaking. They are commonly used in informal writing, such as text messages, emails, and social media posts.