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- superlative form of : most clean
- 2020 November 18, “Network News: Network Rail sets science-based global warming targets”, in Rail, page 22:
- Chief executive Andrew Haines said: "Rail is already the cleanest and greenest mode of transporting large numbers of people and goods, but we're committed to cutting our carbon footprint even further. [...]."
- (archaic) second-person singular simple present form of