Component (noun)

1. A part or element of a larger entity.
2. A distinct part of a machine, system, or mixture.

Origin:

Late 16th century (as a adjective in the sense "composing"): from latin component- "put together", from the verb componere.

Examples:

1. The components of the car engine were carefully assembled.
2. A healthy diet requires several key components.
3. The components of this mixture are mixed together in equal parts.
4. The latest smartphone has several innovative components.
5. This part of the bridge is one of the crucial components of the structure.