Longman Dictionary of Contemporary English homepage

baseline

noun
     
baseā€§line [countable usually singular]
1TMH technical a standard measurement or fact against which other measurements or facts are compared, especially in medicine or science:
The company's waste emissions were 14% lower than in 1998, the baseline year.
2DS the line at the back of the court in games such as tennis or volleyball
3DSB the area that a player must run within, on a baseball field

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