Frequency: The word is one of the 1500 most common words in English.
1.
If you are ~ in a situation or activity, you are taking part in it or have a strong connection with it.
If she were ~ in business, she would make a strong chief executive...
ADJ: v-link ADJ, usu ADJ in/with n
2.
If you are ~ in something, you give a lot of time, effort, or attention to it.
The family were deeply ~ in Jewish culture.
ADJ: v-link ADJ, usu ADJ in n
3.
The things ~ in something such as a job or system are the necessary parts or consequences of it.
We believe the time and hard work ~ in completing such an assignment are worthwhile...
ADJ: v-link ADJ, oft ADJ in n
4.
If a situation or activity is ~, it has a lot of different parts or aspects, often making it difficult to understand, explain, or do.
The operations can be quite ~, requiring many procedures.
= complicated, complex
ADJ
5.
If one person is ~ with another, especially someone they are not married to, they are having a sexual or romantic relationship.
He became romantically ~ with a married woman.
ADJ: oft v-link ADJ with n