It essentially means "he/she/it obtains", "he/she/it acquires", "he/she/it gains", "he/she/it achieves".
Here's an example:
* "Virtus, si adipiscitur, magna est." (Virtue, if it is obtained, is great.)
Note: "Adipiscitur" is used in the passive voice, meaning the subject is receiving the action of the verb.