Having no equal or match; incomparable or unprecedented in quality, extent, or degree.
From 'un-' (not) + 'parallel' (from Greek 'parallelos' meaning 'beside one another,' from 'para-' beside + 'allos' other). First recorded in English around 1620, literally meaning 'without a parallel line or equivalent.'
This word contains a beautiful geometric metaphor - just as parallel lines never meet despite running forever, something unparalleled cannot be matched no matter how far you search. It's mathematics turned into praise, suggesting that true excellence exists in a dimension all its own.
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