An augmentative (abbreviated AUG) is a morphological form of a word which expresses greater intensity, often in size, but also in other attributes. It is the opposite of a diminutive.

Since overaugmenting something often makes it grotesque, in some languages augmentatives are used primarily for comical effect or as pejoratives.

Many languages have augmentatives for nouns; some have augmentatives for verbs.

In modern English, augmentatives can be created with the prefixes:

Since the early 1990s, the prefix über- has also frequently been used as a borrowing from German.

In modern Dutch, augmentatives are usually created with the prefixes:

There are also prefixes that can be used for some adjectives:

In German, there are different ways to build augmentatives. They are rarely used prefixes:

Modern Greek has a variety of augmentative suffixes: -α, -άρα, -αράς, ΄-αρος, -άκλα, -ακλάς, ΄-ακλας.

Italian has several augmentatives:

In Portuguese, the most common augmentatives are the masculine -ão (sometimes also -zão or -zarrão) and the feminine -ona (or -zona), although there are others, less frequently used. E.g. carro "car", carrão "big car"; homem "man", homenzarrão "big man"; mulher "woman", mulherona "big woman".