Degassing
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Wikipedia: Degasification
Sparging
Summary: Bubbling nitrogen through a liquid (usually some solvent) to displace any dissolved oxygen.
Wikipedia: Sparging (chemistry)
Freeze-pump-thaw cycling
Summary: Rapidly freezing a liquid in a Schlenk flask, applying vacuum, sealing the flask, then warming the solid to thaw it. Upon thawing, dissolved gases form bubbles which escape. Repeat thrice.
Wikipedia: Degasification#Freeze-Pump-Thaw cycling