1. Noun, Noun which may take the genitive case particle 'no'

   one cup (of); one glass (of); one bowl (of); cupful; glassful; bowlful; spoonful

   コップ１杯の水をください。

2. Noun

   one drink (of alcohol)

3. Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no', Noun, used as a suffix

   full; filled (with); brimming (with); crowded; packed

   Usually written using kana alone

4. Adverb (fukushi), Noun, used as a suffix

   fully; to capacity; to the maximum; as much as possible

   Usually written using kana alone

5. Adverb (fukushi)

   a lot; much; many

   Usually written using kana alone

6. Noun, used as a suffix, Adverb (fukushi)

   all of ...; the entire ...

   Usually written using kana alone

7. Noun

   one (squid, octopus, crab, etc.)

8. one (boat)

Also written １杯【いっぱい】ippai、一盃【いっぱい】ippai