??? ??? ??? Por Usage 1 Express gratitude or apology ??? ??? ??? Por Usage 2 Multiplication and Division ??? ??? ??? Por Usage 3 For velocity and frequency or proportion ??? ??? ??? Por Usage 4 Meaning along, by, through, or in the area of ??? ??? ??? Por Usage 5 When talking about exchange, including sales ??? ??? ??? Por Usage 6 To mean or on behalf of, in favor of ??? ??? ??? Por Usage 7 To exp