Loan words - plural

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Some words are essentially used in English only in their plural form. Some of these are in the table below. Words listed in square brackets [ ] do not usually occur in English in that form, even in the most academic writing.

[It may help to know that et in Latin (and French) means 'and'.]

Usual (plural) form	Original Singular	Comments
agenda	agendum	= the things that are to be done.
alia	[alium]	= other things.
alii	[alius]	= other people
alumni	alumnus (m), alumnae (f)	(former) student, (former) pupil
arcana	[arcanum]	= 'the secret things', only revealed to initiates.
cetera	[ceterum]	= the other things, as in et cetera
corrigenda	corrigendum	= the things that should be corrected.
data	datum	The singular datum is rare nowadays.
delenda	delendum	= the things that are to be deleted.
emendenda	emendendum	= the things that should be changed.
impedimenta	impedimentum	= baggage. The Latin singular ~ impediment.
marginalia	marginalium
miscellanea	miscellaneum	= miscellany.
paraphernalia	[paraphernalium	The singular paraphernal exists in English. But it is rare.

See also: Some examples of foreign plurals used in academic English and Table of common loan words usually taking the singular form