In Jira, under priority field there are Blocker, Critical, Major, Minor and Trivial Bugs. Could you please define Blocker, Critical, Major, Minor and Trivial?
They are (just) default names for level 1 / 2 / 3 / 4 / 5. If you want them named otherwise, you can do so if you are a Jira Administrator. The only thing to keep in mind, is that you are changing them for your entire instance (for now that is; in the very near future, you will be able to set different priority names at project level).
You could search for any definition online and I could try to give you one, but that would not make any sense. Jira just offers you a list of 5 priority names to manage prioritisation of your bugs or incidents.
Blocker would be the highest level of priority and trivial would be the lowest. The others rank in between.
But Jira does not have any intent to be prescriptive about this. How you manage priorities at your organisation is something you should decide and define for yourself. If you want to use the default priorities of Jira, that's fine. In that case, maybe I should be asking you what they (should) mean to you. If you can't explain them or don't know what they mean, than maybe you should define less or other priorities that match your way of working.
From your question, I cannot make up whether you are Jira Administrator or not. But if you are, then you can and should define clear and understandable priorities yourself. If you are not, it would be best to ask this same question within your own organisation, so it becomes clear what you should use when reporting an issue. In that respect, you have a very valid question.
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