Frequency: The word is one of the 1500 most common words in English.
1.
If you are ~ in something, you think it is important and want to learn more about it or spend time doing it.
I thought she might be ~ in Paula’s proposal...
I’d be ~ to meet her.
ADJ: usu v-link ADJ, oft ADJ in n/-ing, ADJ to-inf
2.
An ~ party or group of people is affected by or involved in a particular event or situation.
All the ~ parties eventually agreed to the idea.
ADJ: ADJ n
3.
see also self-~