1. Coming next after the third and just before the fifth in position or time or degree or magnitude
   - fourth, quaternary

See also: ordinal

Encyclopedia: 4th

• usefully
• usefulness
• useless
• uselessly
• uselessness
• Usenet
• user
• user interface
• user-friendliness
• user-friendly
• username
• Ushas
• usher
• usher in
• usher out
• usherette
• ushering in
• using
• using up
• Uskub
• USMC
• USN
• Usnea
• Usnea barbata
• Usneaceae