What does genki (from genki dama) means? So from the previews from the following episodes we get to know that

(spoilers)


   18 and 17 donates energy to Goku's Genki Dama. People speculated that since they have unlimited energy, Goku could get to form an extremely powerful Genki Dama thanks to their energy but no, because it's been said by some fans that ki energy (attack energy) is different than Genki energy Goku uses for the Genki Dama bomb.


So what does Genki (from Genki Dama) mean?
http://dragonball.wikia.com/wiki/Spirit_Bomb:


  Spirit Bomb (元気玉 Genki Dama, lit. "Energy Sphere")


https://en.wiktionary.org/wiki/元氣


  From Middle Chinese compound 元氣 (ngjwon khjɨjH, literally “first, fundamental, source + vapor, spirit, energy”) In Chinese cosmology, this represented the fundamental force that permeates all matter and life. Early Japanese borrowed this word and meaning. Later, this spelling was conflated with the meaning of homophone 減気 (genki, “recovery from illness”), adding in the modern senses related to healthy and wellness.