There are no objective definitions for words. All definitions are subjective by their nature. Meaning is a mental construction. Words do not possess meaning by themselves.
I can invent my own word. I can invent my own language. If that language becomes popular, we can create our own dictionary. But dictionary definitions are conventional of the words I invented. It makes communication easier. But consensual does not mean objective.
Meaning attributed to objects other than words are also subjective. There is no objective meaning.
References
Patterson, S. There are no objective definitions. http://steve-patterson.com/there-are-no-objective-definitions/