What does XL mean in NASA?

This page is about the meanings of the acronym/abbreviation/shorthand XL in the Governmental field in general and in the NASA terminology in particular.

X-axis of Spacelab

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What does XL mean?

forty, 40, XL(adj)
the cardinal number that is the product of ten and four

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"XL." Abbreviations.com. STANDS4 LLC, 2015. Web. 31 Jul 2015. <http://www.abbreviations.com/term/569339>.