Adolescence /ˌæd

imagination /ɪˌmædʒ.ɪˈneɪ.ʃ ə n/ noun
1. [ C or U ] the ability to form pictures in the mind
My younger son has a very vivid (= active) imagination.
I can never make up stories - I have absolutely no imagination.
For some reason the story captured/caught the imagination of the public (= made them very interested).
It couldn't by any stretch of the imagination be described as a (= it is certainly not a) beautiful city.
There's a sex scene in the film which apparently leaves nothing to the imagination (= shows sexual parts of the body very clearly) .
2. [ U ] something that you think exists or is true, although in fact it is not real or true
Was she paying him a lot of attention or was it just my imagination?
Is it my imagination or is David behaving strangely at the moment?
3. [ U ] the ability to think of new ideas
It's a job that needs someone with a bit of imagination.
infancy /ˈɪn.fən t  .si/ noun [ U ]
1. the time when someone is a baby or a very young child
Her youngest child died in infancy.
2. be in its infancy
to be very new and still developing
The system is still in its infancy.