transcription, транскрипция: [ ɪmædʒɪnəb(ə)l ]
1.
You use imaginable after a superlative such as ‘best’ or ‘worst’ to emphasize that something is extreme in some way.
...their imprisonment under some of the most horrible circumstances imaginable...
= conceivable
ADJ : adj-superl n ADJ , adj-superl ADJ n [ emphasis ]
2.
You use imaginable after a word like ‘every’ or ‘all’ to emphasize that you are talking about all the possible examples of something. You use imaginable after ‘no’ to emphasize that something does not have the quality mentioned.
Parents encourage every activity imaginable.
= possible
ADJ : ADJ n , n ADJ [ emphasis ]