'Tightly' definitions:

Definition of 'tightly'

From: WordNet
adverb
In a tight or constricted manner; "a tightly packed pub"
adverb
Securely fixed or fastened; "the window was tightly sealed"

Definition of 'Tightly'

From: GCIDE
  • Tightly \Tight"ly\, adv. In a tight manner; closely; nearly. [1913 Webster]