Noun ca has 2 senses
  1. calcium, Ca, atomic number 20 - a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
    --1 is a kind of metallic element, metal
    --1 is a substance of
     calcium oxide, quicklime, lime, calx, calcined lime, fluxing lime, unslaked lime, burnt lime; limestone; gypsum; fluorite, fluorspar, fluor
    --1 has particulars: calcium ion, factor IV
  2. California, Golden State, CA, Calif. - a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes
    --2 is a kind of American state
    --2 is a part of
     United States, United States of America, America, US, U.S., USA, U.S.A.
    --2 has parts:
     Channel Islands National Park; Kings Canyon National Park; Lassen Volcanic National Park; Redwood National Park; Sequoia National Park; Yosemite National Park; Anaheim; Bakersfield; Barstow; Berkeley; Beverly Hills; Eureka; Fresno; Long Beach; Los Angeles, City of the Angels; Monterey; Oakland; Palo Alto; Pasadena; Redding; Riverside; Sacramento, capital of California; San Bernadino; San Diego; San Francisco; San Jose; San Mateo; San Pablo; Santa Ana; Santa Barbara; Santa Clara; Santa Cruz; Big Sur; Silicon Valley; Death Valley; Mojave, Mojave Desert, Mohave, Mohave Desert; Lake Tahoe; Donner Pass; Golden Gate; Klamath, Klamath River; Monterey Bay; Russian River; Sacramento River; Salton Sea; San Andreas Fault; San Fernando Valley; San Joaquin River; San Joaquin Valley; Shasta, Mount Shasta; Sierra Nevada, Sierra Nevada Mountains, High Sierra
    --2 has particulars: Colorado Desert
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