[in-gres] 
| 1. | the act of going in or entering. |
| 2. | the right to enter. |
| 3. | a means or place of entering; entryway. |
| 4. | Astronomy. immersion (def. 5). |
[i-mur-zhuh
n, -shuhn] | 1. | an act or instance of immersing. |
| 2. | state of being immersed. |
| 3. | state of being deeply engaged or involved; absorption. |
| 4. | baptism in which the whole body of the person is submerged in the water. |
| 5. | Also called ingress. Astronomy. the entrance of a heavenly body into an eclipse by another body, an occultation, or a transit. Compare emersion (def. 1). |
| 6. | concentrating on one course of instruction, subject, or project to the exclusion of all others for several days or weeks; intensive: an immersion course in conversational French. |
| in·gress (ĭn'grěs') n.
[Middle English ingresse, from Latin ingressus, from past participle of ingredī, to enter : in-, in; see in-2 + gradī, to step; see ghredh- in Indo-European roots.] |
immersion im·mer·sion (ĭ-mûr'zhən, -shən)
n.
The placing of a body under water or other liquid.
The use of a fluid on a microscope slide in order to exclude air from between the glass slide and the bottom lens.