Basis or Bases: Mastering the Singular-Plural Divide
“Basis” is the singular form; “bases” is its plural. One basis, several bases—end of the spelling difference.
People stumble because “bases” sounds like other words—bases in baseball or military bases—so they assume the spelling stays the same for every meaning. That mismatch trips up writers daily.
Correct Spelling and Rules
Add –es to form the plural: basis → bases. Keep the “i” in singular, switch to “e” in plural. Simple swap, no extra letters.
Common Mistakes
Writers often write “basis’s” or “basises.” Both are wrong. No apostrophes, no extra “s”—just bases.
Is it ever okay to say “basises”?
No. The standard plural is always “bases.”
How do I pronounce “bases”?
Rhymes with “places,” not “baseball bases.”
Can “basis” ever be plural on its own?
No. “Basis” is strictly singular; use “bases” for more than one.