I'm writing my book at will - there's no deadline or minimum word count.

… there is no special incentive to adopt a design on the latest French pattern, in which the gear ratio can be changed at will to permit higher tractive efforts on freight duties as an alternative to higher speeds on passenger duties.

And yet, United always carried the greater threat. Their movement in attack constantly confounded Southampton's defenders, with Rooney, Van Persie and Januzaj swapping places and eluding markers at will.

At will

Meaning

Prep_phrase

Adj