1. In order to; used instead of "to", especially after try, come, go 
2. Used to connect words, clauses or sentences

Encyclopedia: And And, Like Sheep, We All Have Gone Astray And, per se, and

• Fourier
• Fourier analysis
• Fourier series
• fourpence
• fourpenny
• fourpenny nail
• fourscore
• foursome
• foursquare
• fourteen
• fourteenth
• Fourteenth Amendment
• fourth
• Fourth Council of Constantinople
• fourth cranial nerve
• Fourth Crusade
• fourth deck
• fourth dimension
• Fourth Earl of Chesterfield
• Fourth Earl of Orford
• fourth estate
• Fourth Lateran Council
• Fourth of July
• fourth part
• fourth power