LTE was used by US Army to designate unanticipated yaw, when they had the problem in the 80's, mainly on OH-58. Bell already noticed in a Service Letter dated July 1984 that the term was misleading.
read what Ascend Charlie posted above, #20 I think, LTE was made up by Bell to cover the fact they put an inadequate TR on the 206.
Rotorbee - I was talking about using the term divergence in an aviation context not a literal dictionary one.