| 1. | able or tending to penetrate; piercing; sharp: a penetrating shriek; a penetrating glance. |
| 2. | acute; discerning: a penetrating observation. |
| 3. | Surgery. noting a wound that pierces the skin, esp. a deep wound entering an organ or body cavity. |
verb, -trat⋅ed, -trat⋅ing.| 1. | to pierce or pass into or through: The bullet penetrated the wall. The fog lights penetrated the mist. |
| 2. | to enter the interior of: to penetrate a forest. |
| 3. | to enter and diffuse itself through; permeate. |
| 4. | to arrive at the truth or meaning of; understand; comprehend: to penetrate a mystery. |
| 5. | to obtain a share of (a market): to penetrate the Canadian coffee market. |
| 6. | to affect or impress (the mind or feelings) deeply. |
| 7. | to extend influence, usually peacefully, into the affairs of (another country). |
| 8. | to enter, reach, or pass through something, as by piercing: We penetrated to the interior of the Kasbah. |
| 9. | to be diffused through something. |
| 10. | to understand or read the meaning of something. |
| 11. | to have a deep effect or impact on someone. |