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

• xanthoma multiplex
• xanthomatosis
• xanthomonad
• Xanthomonas
• Xanthophyceae
• xanthophyl
• xanthophyll
• xanthopsia
• Xanthorrhoeaceae
• Xanthorroea
• xanthosis
• Xanthosoma
• Xanthosoma atrovirens
• Xanthosoma sagittifolium
• xanthous
• Xantusiidae
• Xavier
• xc
• xci
• xcii
• xciii
• xciv
• xcl
• xcv
• xcvi