1. Feeling great rapture or delight
   - ecstatic, enraptured, rapt, rhapsodic, enrapt

See also: joyous, rapture

• once
• once again
• once and for all
• once in a blue moon
• once in a while
• once more
• once upon a time
• once-over
• onchocerciasis
• oncidium
• Oncidium papilio
• Oncidium papilio kramerianum
• oncogene
• oncologic
• oncological
• oncologist
• oncology
• oncoming
• Oncorhynchus
• Oncorhynchus keta
• Oncorhynchus kisutch
• Oncorhynchus nerka
• Oncorhynchus tshawytscha
• oncost
• Oncovin