INCIDENTALLY

[adverb] [not gradable] - used before saying something that is not as important as the main subject of conversation, but is connected to it in some wayWe had a marvellous meal at that restaurant you recommended - incidentally, I must give you the number of a similar one I know of that you might like.Incidentally can also be used when mentioning a subject that has not been discussed before, often making it seem less important than it really is.Incidentally, I wanted to have a word with you about your expenses claim.