Ten letter anagrams

inactivate vaticinate
acervation vacationer
attraction tractation
parentally paternally
alarmingly marginally
antagonist stagnation
decimation medication
coordinate decoration
dictionary indicatory
excitation intoxicate
neoplastic pleonastic
infarction infraction
denominate emendation
admonition domination
enervation veneration
levitation velitation
filtration flirtation
graphology logography
egocentric geocentric
indiscreet indiscrete iridescent
discreetly discretely
discoverer rediscover
compressed decompress
centimeter centimetre
percussion supersonic
percursory precursory
millimeter millimetre
impressive permissive
petitioner repetition
repression respersion
persistent prettiness
impression permission

Found, spring 2000, in dictionary by dpd using process described here.