The Society has always been 'clubby' about inside terminology, secret understandings, a private 'language'. In this sentence I use the word "Society" - which is now no longer freely used to describe the New York offices / Governing Body. The current term is "the Branch" or "World Headquarters" or "the Faithful Slave" or "Mother".
Your references steve2 make sense. > Changes in terminology often indicate changes in leadership as well.
I think the massive doctrinal shifts that have taken place in the last decade (and last year for sure) are being reflected in the changes in words and definitions.
Heck...they even felt the need to rewrite the Bible.