This question is not about definition, but about usage.
According to Babylon dictionary the definition of readily is: "readily. adv. with pleasure, willingly, eagerly" see here: http://dictionary.babylon.com/english/
My question is whether "readily" is used by native speakers as an answer for someone who makes a request in spoken English.
Q: "Can I use your phone please for a moment?"
A: "Yes, readily"
I know the definition of readily, I am asking whether this is appropriate usage.