ID.

 Dictionary entry overview: What does Id. mean? 

• ID. (noun)
  The noun ID. has 1 sense:

1. a state in the Rocky Mountains

  Familiarity information: ID. used as a noun is very rare.

 Dictionary entry details 

• ID. (noun)

Sense 1

Meaning:

A state in the Rocky Mountains

Classified under:

Nouns denoting spatial position

Synonyms:

Gem State; ID; Id.; Idaho

Instance hypernyms:

American state (one of the 50 states of the United States)

Meronyms (parts of "Id."):

Yellowstone National Park (the first national park in the United States; located in the border area between Wyoming and Montana and Idaho; spectacular wilderness; famous for Old Faithful geyser and for buffalo and bears)

Boise; capital of Idaho (the capital and largest city of Idaho)

Coeur d'Alene (a town in the northern panhandle of Idaho; popular resort area)

Idaho Falls (a town in southeastern Idaho on the Snake River)

Lewiston (a town in northwestern Idaho)

Nampa (a town in southwestern Idaho)

Pocatello (a university town in southeastern Idaho)

Sun Valley (a winter sports resort in south central Idaho)

Twin Falls (a town on the Snake River in south central Idaho near the Twin Falls)

Coeur d'Alene Lake (a lake in northern Idaho)

Salmon; Salmon River (a tributary of the Snake River in Idaho)

Snake; Snake River (a tributary of the Columbia River that rises in Wyoming and flows westward; discovered in 1805 by the Lewis and Clark Expedition)

Holonyms ("Id." is a part of...):

America; the States; U.S.; U.S.A.; United States; United States of America; US; USA (North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776)