Long-standing is an adjective used to describe something that has been in existence for a long period of time. It can be used to describe relationships, traditions, and other things that have been around for a while. The crossword solutions for this term are OLD (3 letters), AGEOLD (6 letters), and OLDTIME (7 letters). OLD is the most basic form of the word, meaning something that has been around for a long time. AGEOLD is a more emphatic version, suggesting something that has been around for a very long time. OLDTIME is the most emphatic version, suggesting something that has been around since ancient times.