1. to pass into or through something
2. to understand or discover the meaning of something difficult
3. to succeed in entering or joining a group or organization

Examples

• The bullet penetrated the metal shield.
• Sunlight penetrated through the thick forest canopy.
• Scientists are trying to penetrate the mysteries of the deep ocean.
• It took years for her to penetrate the meaning of the ancient text.
• The spy managed to penetrate the enemy organization.
• The company hopes to penetrate new international markets.
• The cold wind penetrated his thin jacket.