1) Explanations of meaning 2) Work by Plato 1) Meanings 
[Plato] The Definitions (Ὅροι; Definitiones) is a dictionary of about 185 philosophical terms sometimes included in the corpus of Plato`s works. Plato is generally not regarded as the editor of all of Definitions. Some ancient scholars attributed Definitions to Speusippus. ...
definition, definitions 1. The act of defining or making definite, distinct, or clear. 2. The formal statement of the meaning or significance of a word, phrase, or term, as in a dictionary entry. 3. A condition of being definite, distinct, or clearly outlined. 4. The act or process of stating a precise meaning or significance; formulation of a me...
The CIM Definition standards on Mineral Resources and Mineral Reserves provide as follows: