Today's word is "fathomable". This is an adjective which means knowable or comprehensible. For example, you can say, "Thirty years ago, not many people would have thought that they could buy a personal computer. Such an idea was not fathomable by ordinary people back then."
Türkçe Karşılığı :
derinligi ölçülebilir, Ulaşılabilir