1. (informal) anything complex, detailed or confusing 
2. The science or study of rockets and their design

Encyclopedia: Rocket science

• encoding
• encolure
• encomiast
• encomiastic
• encomium
• encompass
• encompassing
• encompassment
• encopresis
• encore
• encounter
• encounter group
• encourage
• encouraged
• encouragement
• encourager
• encouraging
• encouragingly
• encrimson
• encroach
• encroach upon
• encroacher
• encroaching
• encroachment
• encrust