1. The ordinal number of four hundred in counting order
   - 400th

See also: ordinal

• Ipomoea alba
• Ipomoea batatas
• Ipomoea coccinea
• Ipomoea fastigiata
• Ipomoea imperialis
• Ipomoea leptophylla
• Ipomoea nil
• Ipomoea orizabensis
• Ipomoea panurata
• Ipomoea pes-caprae
• Ipomoea purpurea
• Ipomoea quamoclit
• Ipomoea tricolor
• IPR
• ipratropium bromide
• iproclozide
• ipse dixit
• ipsedixitism
• ipsilateral
• ipso facto
• Ipsus
• IPV
• IQ
• IQ test
• ir-