Any word used in the definition of another word may be used in any of the senses by which it is defined. In most cases, the exact sense in which a word is being used in the definition should be able to be determined by the context of the definition as a whole. Sometimes more than one sense of a word used in an entry for another word will be applicable. This usually occurs if a word has two more closely related senses (such as an original literal sense and a figurative sense derived from it).
If it is not actually possible to determine the intended sense of a word from the context of the definition in which it appears, then this could be the result of a definition which is not as well-crafted as intended. When composing definitions, a considerable amount of effort is put into ensuring that they are as precisely and clearly worded as possible so that there is little chance for ambiguity or misunderstanding.