1. Having existed for a long time
   "a longstanding friendship"; "the longstanding conflict"

See also: long

• ideologist
• ideologue
• ideology
• ides
• idesia
• Idesia polycarpa
• IDF
• idioblast
• idiocy
• idiograph
• idiographic
• idiolatry
• idiolect
• idiom
• Idiom Neutral
• idiomatic
• surveillance
• surveillance of disease
• surveillance system
• surveillant
• survey
• survey mile
• surveying
• surveying instrument
• surveyor