A smaller version or image of something; a miniature representation (though 'mino' is not standard modern English—'mini' or 'miniature' are more common).
Short form or prefix derived from 'miniature,' which comes from Latin 'minimus' (smallest). The prefix 'mini-' became productive in English in the 20th century for creating diminutive forms.
The prefix 'mini-' exploded into popular use in the 1960s (miniskirts, minivans, minicomputers), and it's an example of how languages create shortcuts—instead of saying 'small car' repeatedly, we just say 'mini.'
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