or 
/ˈoɚ, ɚ/ conjunction
/ˈoɚ, ɚ/ conjunction 1 — used to introduce another choice or possibility ▪ You can have coffee or tea. ▪ Would you like beer, wine, or something else? ▪ He must be her brother—or is he? [=maybe he is not her brother] ▪ I'll call (either) today or tomorrow. ▪ (somewhat informal) I didn't mean to annoy you or anything. ▪ (somewhat informal) Can I get you a cup of coffee or something? 2 — used in negative statements to introduce something else that is also true ▪ We couldn't stop or even slow down the whole time. [=we could not stop and we could not slow down] ▪ They have no food or water. [=they do not have food and they do not have water] 3 — used to say what will happen if a specified thing is not done ▪ Finish your dinner or you won't get any dessert. [=if you do not finish your dinner, then you will not get any dessert] ▪ Be at the station by 5 o'clock or you will miss the bus. 4 — used to introduce another number or amount that is possibly the correct one ▪ It's been two or three years since I've seen her. ▪ The package should arrive in five or six days. ▪ We waited for an hour or more. 5 — used to introduce the reason why something said previously is true ▪ He must be hiding something or he wouldn't be lying. [=he would not lie if he were not hiding something; the fact that he is lying means that he must be hiding something] 6 a — used to introduce a word or phrase that defines or explains what another word or phrase means ▪ Botany, or the science of plants, is a fascinating subject. = The science of plants, or botany, is a fascinating subject. ▪ This pan is used for sautéing, or frying, the vegetables.
b — used to introduce a word or phrase that corrects or states more precisely something you have just said ▪ We got here quickly—or more quickly than last time, anyway. = We got here quickly—or at least more quickly than last time. ▪ The building is 500, or to be precise, 502 years old. ▪ She breeds rabbits, or rather hares.
b — used to introduce a word or phrase that corrects or states more precisely something you have just said ▪ We got here quickly—or more quickly than last time, anyway. = We got here quickly—or at least more quickly than last time. ▪ The building is 500, or to be precise, 502 years old. ▪ She breeds rabbits, or rather hares.
or else — see 1else
or so — see 2so
