As a Noun: 1. The idea that something is true, sometimes wrongly, e.g., for no good reason or without strong evidence. English = assumption. 2. An action or way of behaving that is intended to make people believe something that is not true. English = pretence. 3. An approximate calculation, or the result obtained by such a calculation; a judgement which you make about a person or situation, without very good evidence or reason. English = estimate, estimation. As a Verb or Adjective: 1. To think that something (usually pleasant) is true or will happen, sometimes wrongly (because you have no good reason or evidence for believing it). English = assume, pretend, estimate. 2. To act or behave in a way that is intended to make people believe something that is not true. English = pretend. 3. To make an approximate calculation. English = estimate. Interactive: 1. Used alone in response to an invitation to do something (usually pleasant) to mean that you are happy or willing to accept because you can see no reason not to. English = 'Why not?!', 'OK, just for the sake of it!', 'Let's give it a go!', 'Just for the hell of it!' 2. Used parentheticially (i.e., as an aside, or interrupting something else you are saying) to mean you are just suggesting something and do not mean it is certain. English = say, suppose, for example. As Modifier: 1. Used at the beginning of a sign sentence to mean the acton in that sentence is done for no particular reason, or just for the sake of it, e.g., for amusement or fun, or because you can see no reason why not to do it. English = "Why not?!", "Just for the sake of it," "Just for the hell of it." 2. Used to introduce something or between the mention of two things to mean that the thing you introduce, or the two things you mention, are roughly like some other thing or each other. English = say (i.e., "for instance"), for example. 3. Used at the beginning of a sign sentence to mean that the action in that sentence is not real or actual, but you are going to pretend it is and see what that means. The situation you imagine is usually positive. You know a past action did not happen, a current action is not happening, or a future action has not happened yet, but you talk about it anyway. English = if.