3.20 On or About-Defined is a legal term used in contract law. It is used to indicate that a certain action must occur no later than a specified date, but the exact date does not need to be specified. This allows some flexibility for the parties involved, as the exact date is not set in stone, but the action must still be taken within a certain time frame. There are two different types of 3.20 On or About-Defined: "Absolute" and "Reasonable". The "Absolute" type requires that the action must take place on the exact date or within a few days of that date. The "Reasonable" type requires that the action must take place within a reasonable amount of time from the specified date.