Aside from a precise denotation of an object, a quality definition should follow a specific structure of words. Such an approach makes it easy to explain a definition, and also lays a foundation for the development of a whole group of new definitions. This can be best illustrated by the example of the Modifier-Nature structure.

Definitions that follow this structure use the next two concepts:

• Modifier. Denotes any feature that modifies the original object. It's conveyed through an adjective.
• Nature. Denotes the original object and its very essence. It's conveyed through a noun.

To denote a creature, it's worth considering the following definitions:

• Anthropomorphic beast. "Anthropomorphic" is a modifier that denotes the family or species of a creature from which additional features were taken. "Beast" denotes the nature and base species of a creature.
• Beastmorphic human. "Beastmorphic" is a modifier that denotes the family or species of a creature from which additional features were taken. "Human" denotes the nature and base species of a creature.
• Andromorphic woman. "Andromorphic" is a modifier that denotes the appearance pattern. "Woman" denotes the natural gender of a person.
• Gynomorphic man. "Gynomorphic" is a modifier that denotes the appearance pattern. "Man" denotes the natural gender of a person.
• Beast-shifting human. "Beast-shifting" is a modifier that denotes a shapeshifter's alternative form, while "human" denotes its natural and main form.
• Human-shifting beast. "Human-shifting" is a modifier that denotes a shapeshifter's alternative form, while "beast" denotes its natural and main form.
• Beastmerged human (a creature similar to a centaur). "Beastmerged" is a modifier that denotes a body used for locomotion and at the withers with which the main body is merged. "Human" denotes the main body including head, arms and torso, and which is merged with the lower body at the place of own waist.
• Androphilic woman. "Androphilic" is a modifier that denotes a person's attraction to masculine partners of either gender. "Woman" denotes a person themself.
• Gynephilic man. "Gynephilic" is a modifier that denotes a person's attraction to feminine partners of either gender. "Man" denotes a person themself.
• Ambiphilic man. "Ambiphilic" is a modifier that denotes a person's attraction to both masculine and feminine partners of either gender. "Man" denotes a person themself.
• Malebehaved woman. "Malebehaved" is a modifier that denotes that a person behaves according to the male behavioral archetype. "Woman" denotes a person themself.
• Femalebehaved man. "Femalebehaved" is a modifier that denotes that a person behaves according to the female behavioral archetype. "Man" denotes a person themself.

In addition to using two concepts, the Modifier-Nature structure allows several methods of forming definitions:

• Shortening a definition in order to facilitate its pronunciation and writing, which in turn makes it easier to apply other methods.
• Changing the modifier or nature in order to control the precision of a definition.
• Using multiple modifiers to denote a number of object's properties.
• Using a definition as a modifier or nature to form a new, compound definition.

It is worth noting that each definition that follows this structure can consist of many modifiers, but only one nature.

Shortening a definition means merging its adjective and noun into a single compound noun, such as:

• "Anthropobeast" instead of "Anthropomorphic beast".
• "Beasthuman" instead of "Beastmorphic human".
• "Androwoman" instead of "Andromorphic woman".
• "Gynoman" instead of "Gynomorphic man".

The control of the precision can be demonstrated by the "beastmorphic human" definition. Changing the modifier will specify the family or species of a creature from which additional features were taken, resulting in words such as "bovinemorphic" and "bullmorphic". Meanwhile, changing the nature will specify the base species, gender and age of a creature, resulting in words such as "man", "woman", "boy" and "girl". Thus, the generalized "beastmorphic human" definition can be transformed into a more precise one - "bullmorphic man".

When several modifiers are used, the one that is adjacent to the nature can be merged with it into a compound noun, like in the "gynomorphic bullman" definition.

The formation of a compound definition can be demonstrated by the complication of the "beast-shifting human" definition. The "anthropobeast" definition can serve as a modifier, which will form a compound definition - "anthropobeast-shifting human". In this case, the shapeshifter's alternative form will not be an ordinary beast, but an anthropobeast. Moreover, another definition, such as "beasthuman", can serve as a nature, what in turn will form a new compound definition - "Anthropobeast-shifting beasthuman". Now, the shapeshifter's alternative form will be an anthropobeast, while the main form will be a beasthuman. It is worth noting that the modifier and nature can be specified, deriving a definition like "Anthropowolf-shifting wolfman".