Frequency: The word is one of the 1500 most common words in English.
1.
If you are ~ to do something, you are willing to do it if necessary.
Are you ~ to take industrial action?...
= willing
ADJ: v-link ADJ to-inf
2.
If you are ~ for something that you think is going to happen, you are ready for it.
Police are ~ for large numbers of demonstrators...
? un~
ADJ: v-link ADJ for n
3.
You can describe something as ~ when it has been done or made beforehand, so that it is ready when it is needed.
He ended his ~ statement by thanking the police.
ADJ: ADJ n