когда

1) General subject: as, at what time, ever, just as (he came in as I was speaking - он вошёл, когда я говорил; just as he reached the shore - как только он достиг берега), now, sometimes, upon that, what time, when, while, with that, at the same time (контекстуальный перевод на русс. язык), where

2) Mathematics: in case that

3) General subject: when (при одновременности действия: в то время, как...)

4) Makarov: whenever, whilst

5) Phraseological unit: by the time (I'll be an old man by the time you finish.)