ca
Học thuậtThân thiện
Definition
- Proper noun:
- California: A state located on the West Coast of the United States of America, known for its large size, diverse geography, and major cities like Los Angeles and San Francisco.
- Chemical symbol for Calcium: A chemical element (symbol Ca) with atomic number 20. It is a soft, silvery-white alkaline earth metal.
Usage Examples
- Proper noun (California):
- She moved to CA for a new job.
- The wildfires in CA have been devastating this season.
- Chemical symbol (Calcium):
- Milk is a good source of Ca.
- The chemical formula for limestone is CaCO₃.
Advanced Usage
- As an abbreviation in addresses: "CA" is the official two-letter postal abbreviation for the state of California.
- Please ship the package to: 123 Main St, San Diego, CA 92101.
- In scientific contexts: "Ca" is used in formulas, equations, and nutritional labels to denote the element calcium.
- The lab results showed elevated levels of Ca²⁺ ions.
Variants and Related Words
- California (n): The full name of the state.
- Californian (adj/n): Of or relating to California; a person from California.
- Calcium (n): The full name of the chemical element.
Synonyms
- For the state: Golden State (nickname), Calif. (alternate abbreviation).
- For the element: None; it is a specific chemical symbol.
Notes on Usage
- When used as the state abbreviation, "CA" is typically written in uppercase letters.
- When used as the chemical symbol, "Ca" is written with an uppercase 'C' and a lowercase 'a'.
- The meaning is almost always determined by context (geographical vs. scientific).
Noun
- a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes
- 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