What is Particulars?

Legal Definition
Practice. The items of which the accounts of one of the parties is composed, and which are frequently furnished to the opposite party in a bill of particulars. (q. v.)
-- Bouviers Law Dictionary
Legal Definition
The details of a claim or the separate items of an account. When these are stated in an orderly form, for the information of a defendant, the statement is called a "Mil of particulars," (q. v.)
-- Black's Law Dictionary
Legal Definition
-- Ballentine's Law Dictionary