At first (10)
'at first' is the definition.
(synonyms)
This is all the clue.
(Other definitions for initially that I've seen before include "At the start" , "To begin with" , "At first" , "In the beginning" , "How laser, for example, was put together" .)
'at first' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for originally that I've seen before include "At the start" , "In the first place" , "to begin with" , "new way" .)