1. the inner parts or workings of something, especially a machine, system, or organization
Usage: usually plural
2. the internal organs of a person or animal
Usage: informal; usually plural

Examples

• The technician examined the computer’s internals to find the problem.
• She studied the internals of the engine before attempting repairs.
• The company’s internals were restructured after the merger.
• The mechanic had to access the car’s internals to fix the transmission.
• The doctor explained how the body’s internals work together.
• Understanding the internals of this software requires advanced programming knowledge.