handy; convenient to use; just right for use
Describes something that is at a good stage or condition for use, often implying it is well-worn, broken in, or at peak usability.
This dictionary is handy; I can quickly find the word I want to look up.
The new shoes have finally become comfortable to use.
Compound of 使い (stem of 使う, 'to use') and 頃 ('time, about the right time'). The exact historical derivation is uncertain, but it follows a common pattern for expressing optimal timing.