After analyzing the relationship between the feature "month" and the task of whether the client subscribes to a term deposit or not, here is the dictionary:

```json
{
	"no": ["may", "jun", "jul", "aug", "oct", "nov", "dec"],
	"yes": ["mar", "apr", "sep"]
}
```

Based on the data available, the clients who subscribe to a term deposit are more likely to have been contacted during the months of March, April, and September. On the other hand, clients who do not subscribe to a term deposit are more likely to have been contacted during the months of May, June, July, August, October, November, and December.