noun.
One who conforms to the prevailing ways and opinions of one's time or condition for personal advantage; an opportunist.
The Century Dictionary and Cyclopedia
noun.
One who acts conformably to times and seasons: now generally applied to one who meanly and for selfish ends adapts his opinions and manners to the times; one who panders to the ruling power.
noun.Synonyms See definitions of temporizer and trimmer.
the GNU version of the Collaborative International Dictionary of English
noun.
One who adapts his opinions and manners to the times; one who obsequiously compiles with the ruling power; -- now used only in a bad sense.