e-liquid nicotine concentration

Parent class and superclasses all the way to to 'Entity'

This is an ontological definition of the entity using the standard format of specifying the parent class followed by specification of characteristics that distinguish this class from others in that class

This specifies terms that are often used instead of the formal label. A given synonym may relate to more than one label and labels may have more than one synonym so it is better to use the formal label than any synonyms when writing to avoid confusion.

This indicates whether the entity has fuzzy boundaries e.g. adolescence. In that case users of the term must precisely specify the operationalisation of the class in each usage.