1. (adverb)where used to ask a question about location or position Where should I sit?; Where are you going on vacation?
2. (conjunction)where at, in, or, to a location or position You turn right where the road bends.; We're going south where the weather is better.
3. where at a particularpoint in a process or situation a point in their marriage where things were very bad
Definition of 'where'
Webster Dictionary
1. (adverb)where at or in what place; hence, in what situation, position, or circumstances; -- used interrogatively
2. (adverb)where at or in which place; at the place in which; hence, in the case or instance in which; -- used relatively
3. (adverb)where to what or which place; hence, to what goal, result, or issue; whither; -- used interrogatively and relatively; as, where are you going?
Sense: (to or in) which place (?) Where are you going (to)?; Do you know where we are?; Where does he get his ideas from?; We asked where to find a good restaurant.