General:
* Definition: This is the most common and straightforward word.
* Meaning: This is very similar to "definition" but can sometimes have a broader sense.
* Sense: This emphasizes that a word can have multiple meanings.
* Interpretation: This suggests a more subjective understanding of the word.
More specific:
* Connotation: This refers to the implied or associated meanings of a word, beyond its literal definition.
* Denotation: This refers to the literal meaning of a word, as defined in a dictionary.
* Semantic field: This refers to the group of words that relate to a particular concept or topic.
Formal:
* Lexical meaning: This is a technical term used in linguistics.
Ultimately, the best word to use depends on the specific context and the nuance you want to convey.