Browse the Concise Encyclopedia
- introvert and extravert
- intrusive rock
- intuition
- intuitionism
- invar
- inventory
- inverness
- inverse function
- invertebrate
- investiture controversy
- investment
- investment bank
- investment casting
- investment credit
- investment trust
- io
- iodine
- iodine deficiency
- ion
- ion-exchange resin
- ionia
- ionian
- ionian islands
- ionian revolt
- ionian school
- ionian sea
- ionic bond
- ionization
- ionization potential
- ionosphere
- ip address
- ipecac
- iphigeneia
- ipsus, battle of
- ipswich
- iq
- iqaluit
- iqta'
- iran hostage crisis
- iran-contra affair
- iran-iraq war
- iranian languages
- iranian religions
- iraq war
- irbid
- irgun zvai leumi
- iridium
- iris family
- irish elk
- irish language
- irish literary renaissance
- irish potato famine
- irish republican army (ira)
- irish sea
- irish terrier
- irish wolfhound
- iron
- iron act
- iron age
- iron curtain
- iron-deficiency anemia
- ironclad
- ironweed
- ironwood
- irony
- iroquoian languages
- iroquois
- iroquois confederacy
- irrational number
- irrigation
- irritable bowel syndrome
- irtysh river
- irvine
- isaiah
- isdn
- ise shrine
- ishmael ben elisha
- ishtar
- ishtar gate
- isis
- islam
- islam, pillars of
- islamic arts
- islamic caste
- islamic salvation front
- island
- island arc
- islands, bay of
- isle royale national park
- isma'ili
- isnad
- isolationism
- isoleucine
- isomer
- isomerism
- isonzo, battles of the
- isoprenoid
- isospin
- isostasy
- isotope