Definition of prelaunch in English:

prelaunch

Syllabification: pre·launch
Pronunciation: /prēˈlônCH, -ˈlänCH/

Entry from US English dictionary

adjective

Concerning activities or conditions before the launch of a spacecraft, campaign, product, etc.

Definition of prelaunch in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal