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3.17 Plural forms of nouns
Note the following singular and plural forms:
- addendum
- addenda
- alumna
- alumnae
- alumnus
- alumni
- analysis
- analyses
- antenna
- antennae (feelers) or antennas (aerials)
- appendix
- appendixes (or appendices)
- bacterium
- bacteria
- basis
- bases
- bureau
- bureaus
- bus
- buses
- census
- censuses
- crisis
- crises
- criterion
- criteria
- ellipsis
- ellipses
- erratum
- errata
- focus
- focuses (not focusses, which is the preferred verb form)
- formula
- formulas (or formulae)
- gas
- gases (not gasses, which is the verb form)
- hypothesis
- hypotheses
- index
- indexes (of a book) or indices (in mathematics, statistics)
- matrix
- matrices
- medium
- (medium or media) (check dictionary for plural form to use in a given context)
- memorandum
- memorandums (or memoranda)
- nucleus
- nuclei
- parenthesis
- parentheses
- phenomenon
- phenomena
- plateau
- plateaus
- surplus
- surpluses
- symposium
- symposiums (or symposia)
Many other English words form their plurals irregularly, including some of those ending in y, o, f and fe.
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