The aim of this diploma thesis is to prove that augmentative and diminutive suffixes are not always just bearers of senses "big" / "of big size", in the case of augmentative suffixes, and "small" / "of small size", in the case of diminutive suffixes, and that they can also be accompanied by various connotations. The thesis is divided into several parts. The first part is concentrated on the topic of the morpheme in Portuguese in general. The next two parts are dedicated to particular augmentative and diminutive suffixes, concretely to their origin and especially to their specifics. Fundamental is the last part which focuses on the systematization of the senses of suffixes mentioned in previous chapters. Key words: word-formation, derivation, suffixes, augmentative suffixes, diminutive suffixes, connotation