quickening

Short definition from Wiktionary

Verb

1. 1
   present participle and gerund of quicken

Noun

1. 1
   An increase of speed.
2. 2
   The action of bringing someone or something to life.
3. 3
   The first noticeable movements of a foetus during pregnancy, or the period when this occurs.
4. 4
   Stimulation, excitement (of a feeling, emotion etc.).