Definition of opponent for English Language Learners. : a person, group, etc., that is against something (such as an action, law, or system) : someone or something that does not want something to exist, be done, etc.
Generally, your first mortgage payment is due on the 1st day of the 2nd month following your closing date. For example, if you close in February, your first mortgage payment will be due on Aproil 1st. Generally speaking of course.
You don't make your first house payment at closing, but the lender wants you to pay interest for each day you own the home. If you close on the 29th of the month, you only have to pay interest for two or three days. If you close on the 1st, you have to pay interest for every day in that month.