The act of reflecting or the state of being reflected. Something, such as light, radiant heat, sound, or an image, that is reflected. Serious thinking or careful consideration: engaged in reflection on the problem. A thought or an opinion resulting from such thinking or consideration: wrote down her reflections. An indirect expression of censure or discredit: a reflection on his integrity. A manifestation or result: Her achievements are a reflection of her courage. Anatomy The folding of a membrane from the wall of a cavity over an organ and back to the wall. The folds so made.