B1[S or U]the feeling of wanting to give your attention to something or of wanting to be involved with and to discover more about something: I've always had an interest in astronomy.He never seems to show any interest in his children.Unfortunately, I lost interest half way through the film.She takes more of an interest in politics these days.informalJust out of interest, how old is your wife?Excitement, interest, energy and enthusiasmB1[C]Your interests are the activities that you enjoy doing and the subjects that you like to spend time learning about: On his form he lists his interests as cycling and cooking.Pastimes - general wordsB1[U]the quality that makes you think that something is interesting: Would this book be of any interest to you?Excitement, interest, energy and enthusiasm