What’s the plural of subpoena duces tecum?
ANSWER: Subpoenas duces tecum. This phrase — like any other containing a postpositive adjective — takes its plural on the noun at its beginning, the phrase’s “head.” Similar plurals include these:
accounts payable
accounts receivable
acts malum in se
agents provocateur
ambassadors extraordinary
annuities certain
attorneys general
bodies corporate
brothers-in-law (but my in-laws)
chattels personal
chattels real
cities proper
commanders-in-chief
conditions precedent
conditions subsequent
corporations de facto
corporations de jure
courts-martial
dates certain
easements appurtenant
fathers-in-law
fees simple
heirs apparent
letters patent
letters rogatory
letters testamentary
mayors pro tem
ministers plenipotentiary
mothers-in-law
notaries public
parties defendant
poets laureate
postmasters general
pounds sterling
presidents-elect
professors emeriti
rights-of-way
secretaries general
sisters-in-law
sums certain
surgeons general
Of course, some of these are antiquated: today, we tend to refer to defendants rather than parties defendant.
Meanwhile, over decades and centuries, the headword can shift. Even though we say sums certain, most literate writers would probably use sum totals, just as they would use totals as a plural noun when needed.
Fortunately, we have a limited number of postpositive adjectives in English. No matter how many sticklers for grammar might inhabit a single law office, these pluralizing points seem unlikely to foment battles royal.
By the way, a story in The Onion (9-20-2000) placed the late language maven William Safire in a Manhattan Burger King ordering “two Whoppers Junior.” In an online discussion transcribed and published in The Washington Post (4-23-2008), Safire acknowledged ordering “Whoppers Junior” — but only “because it gets a funny look or a laugh.”
Sources:
Garner’s Dictionary of Legal Usage 685, 692, 856 (3d ed. 2011).
Garner’s Modern American Usage 638, 648 (3d ed. 2009).
Thanks to Cecelia Soboleski and Michael Starkman for suggesting this topic.
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