1. Introduces a conditional clause
   "I will go to university if I can afford it" 
2. Despite being
   "he's nice, if rather patronizing" 
3. Every time that
   "if I call you are always engaged"
   - whenever, when

Encyclopedia: If

• orangeness
• orangery
• orangewood
• orangish
• orangish-red
• orangutan
• orangutang
• Orasone
• orate
• oration
• orator
• oratorical
• oratorio
• oratory
• oratrix
• orb
• orb web
• orb-weaver
• orb-weaving
• orb-weaving spider
• orbicular
• orbiculate
• orbiculate leaf
• Orbignya
• Orbignya cohune