Use the intuitive meaning of the words: a credit means you have money coming in, a debit means you have money going out. An increase in assets, income, or equity is a credit, and an increase in expenses or liabilities is a debit, and vice versa.
Or, alternatively, just use "credit" for any increase, and "debit" for any decrease. But this:
"Definition 6: Credit - An entry that represents money leaving an account."
is just totally backwards.
