one

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one

1. the smallest whole number and the first cardinal number; unity
2. a numeral (1, I, i, etc.) representing this number
3. Music the numeral 1 used as the lower figure in a time signature to indicate that the beat is measured in semibreves
4. the one (in Neo-Platonic philosophy) the ultimate being
5. the Holy One or the One above God
6. the Evil One Satan; the devil
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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Long-Evans rats were exposed to one of three lead exposure regimens from birth until postnatal day 40, followed by treatment with succimer (one or two 3-week regimens) or vehicle.
"Last season I think there were just one or two Welsh players and the rest were English.
Overall, the president is asking for one or two years of service; most teacher recruits would presumably spend most or all of that time teaching.