1. Moving upward or along at a considerable height
   "some highflying fighter pilot fired a cannon shell into it" 
2. Extravagant or ambitious or extreme in aims or opinions
   "they did not understand what had happened at the once highflying company"

See also: ascending, unrestrained

• periodic movement
• periodic sentence
• periodic table
• periodical
• periodical cicada
• periodically
• periodicity
• periodontal
• periodontal disease
• periodontia
• periodontic
• periodontics
• periodontist
• periodontitis
• perioperative
• Periophthalmus
• periosteum
• peripatetic
• peripateticism
• Peripatidae
• Peripatopsidae
• Peripatopsis
• peripatus
• peripeteia
• peripetia