Princeton's WordNet

1. water level(noun)

   the level of the surface of a body of water

2. water table, water level, groundwater level(noun)

   underground surface below which the ground is wholly saturated with water

   "spring rains had raised the water table"

3. waterline, water line, water level(noun)

   a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship

4. water level(noun)

   a water gauge that shows the level by showing the surface of the water in a trough or U-shaped tube

Wiktionary

1. water level(Noun)

   The level of a body of water, especially when measured above a datum line

2. water level(Noun)

   The level of the water table below ground

3. water level(Noun)

   The waterline of a ship

Webster Dictionary

1. Water level(u)

   the level formed by the surface of still water

2. Water level(u)

   a kind of leveling instrument. See under Level, n

• watervlakAfrikaans
• مُسْتَوى سَطْح الماءArabic
• ниво на водатаBulgarian
• nível da águaPortuguese (BR)
• vodní hladinaCzech
• der WasserspiegelGerman
• vandstandDanish
• στάθμη του νερούGreek
• nivel del aguaSpanish
• veetaseEstonian
• سطح آبFarsi
• veden pintaFinnish
• niveau d'eauFrench
• מִפלָס הַמַיםHebrew
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• razina vodeCroatian
• vízszintHungarian
• permukaan airIndonesian
• vatnsborð/-hæðIcelandic
• livello dell'acquaItalian
• 水位Japanese
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• nível da águaPortuguese
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• уровень водыRussian
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• ระดับผิวน้ำThai
• su düzeyiTurkish
• 水平面Chinese (Trad.)
• рівень водиUkrainian
• سطح آبUrdu
• mực nướcVietnamese
• 水平面Chinese (Simp.)