American Heritage Dictionary
(6)
Century Dictionary
GNU Webster's 1913
WordNet
(8)
Elsewhere on the web
"The case where men and women do the same job but receive different rates of pay is the paradigm of the kind of situation which the Act was intended to prevent, how would it seem if the roles were reversed and the 'piggyback' claimants were not men but women?"— BBC News | News Front Page | World Edition
Decisions still must be made on how much funding to direct to stem cell research, a perennial fight, and whether to divert $60 million in local "piggyback" income tax revenue to state coffers, as the House proposed.— Blog updates
The measure (SB 1112) would correct a law passed last year to "piggyback" Florida's corporate income tax to the federal tax code.

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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