HDHD /ˌeɪtʃ ˈdiː◂/ adjective 
(high-definition) HD televisions or video equipment produce very clear pictures
(high-definition) HD televisions or video equipment produce very clear pictures- instantaneously
- instantly
- instant message
- instant messaging
- instant replay
- instead
- instep
- instigate
- instigation
- instigator
- instil
- instinct
- instinctive
- instinctively
- instinctual
- institute
- Institute of Economic Affairs
- institution
- institutional
- institutionalize
- institutionalized
- in-store
- instruct
- instruction
- instructional