/ ɪˈmædʒɪnəbl; NAmE / adjective
1.
used with superlatives, and with all and every , to emphasize that sth is the best, worst, etc. that you can imagine, or includes every possible example :
The house has the most spectacular views imaginable.
They stock every imaginable type of pasta.
2.
possible to imagine :
These technological developments were hardly imaginable 30 years ago.
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WORD ORIGIN
late Middle English : from late Latin imaginabilis , from Latin imaginare form an image of, represent, from imago , imagin- image.