ca
ca — abbreviation
1. the standard short written form for the US state of California, used in mailing
the standard short written form for the US state of California, used in mailing addresses, maps, weather reports, and other space-saving labels.
Please send the contract to Sacramento, CA 95814 by courier.
[city], CA [zip] in a mailing address
Wildfire warnings were issued across northern CA after the storm.
CA as state shorthand in news and weather
The conference badge lists Elena's office as San Jose, CA.
A film crew drove from Nevada into CA before sunrise.
The parcel tracker still shows the package in Fresno, CA.
- California
the full state name, used in speech and normal prose
- Calif.
an older written abbreviation; less standard than the postal form CA
文法句型
[city], CA [zip]
northern CA
in CA
用法筆記
Usually written in capitals without periods in modern US postal style. It normally appears after a California city name or in short regional labels, not in ordinary running prose where the full name 'California' is more natural.
常見錯誤
ca — symbol
1. the chemical symbol for calcium, an element found in bones, teeth, and many food
the chemical symbol for calcium, an element found in bones, teeth, and many foods, shown as 'Ca' in formulas, lab reports, and the periodic table.
Hui circled Ca on the periodic table before the quiz.
Ca as a periodic-table symbol
The blood test report marked Ca as slightly below normal.
Ca in a medical lab report
The fertilizer label lists Ca beside magnesium and sulfur.
Students learned that Ca stands for calcium in chemistry class.
Karim wrote Ca beside the word calcium in his lab notebook.
- calcium
the full element name, used in speech and general writing
文法句型
Ca on the periodic table
Ca level
Ca in a formula
用法筆記
Always written with a capital C and a lowercase a. Use this form in chemistry and nutrition contexts; the full word 'calcium' is more natural in ordinary speech and non-technical writing.