un-
prefix
- (indicating reversal/cancellation of the action to which the prefix attaches)
prefix
- not, negative
Wiktionary
Pronunciation: /ʌn/ / /an/
prefix
Etymology: Etymology tree Proto-Indo-European *ís? Proto-Indo-European *h₁óynos Proto-Italic *oinos Old Latin oinos Latin ūnusbor. English un- Borrowed from Latin ūnus.
- Used for the digit one to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name.
“un- (“1”) + bi- (“2”) + un- (“1”) + -ium (element suffix) → unbiunium (“element 121”)”
- Used to form large numbers as the first in the sequence.
“un- + decillion (“10³³”) → undecillion (“10³⁶”)”
“un- + vigintillion (“10⁶³”) → unvigintillion (“10⁶⁶”)”