hi

adj

Etymology: From high.

1. Informal spelling of high, often in hyphenated terms.

   “Get hi-quality videos here!”

intj

Etymology: American English. First recorded reference is to speech of a Kansas Indian (1862); originally to attract attention, probably a variant of Middle English hey, hy (circa 1475). Also an exclamation to call attention. See hey.

1. A friendly, informal, casual greeting said upon someone's arrival.

   “Hi, how are you?”

   “I just dropped by to say “hi”.”

2. An exclamation to call attention.

   “I made a speaking trumpet of my hands and commenced to whoop “Ahoy!” and “Hello!” at the top of my lungs. […] The Colonel woke up, and, after asking what in brimstone was the matter, opened his mouth and roared “Hi!” and “Hello!” like the bull of Bashan.”

   “'Come back now!' shouted Sam. 'Hi! Come back!' But Gollum had vanished.”

3. Expressing wonder or derision.

   “How did he do that, hi?”

   “That’s mad, hi!”

name

1. Abbreviation of Hawaii: a state of the United States.

noun

1. Abbreviation of high (“high gear or high range”).
2. Initialism of hyperspectral imaging.