I, inoun [ C or U ]
uk/aɪ/us/aɪ/plural Is, I's or i'sI, i noun [ C or U ] (LETTER)
the ninth letter of the English alphabet
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Letters of alphabets
- A, a
- alphabetic
- B, b
- C, c
- chi
- iota
- J, j
- K, k
- kappa
- L, l
- psi
- Q, q
- R, r
- rho
- S, s
- Y, y
- Z, z
- zed
- zee
- zeta
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I, i noun [ C or U ] (NUMBER)
also i the sign used in the Roman system for the number 1 and as part of the numbers 2 (ii), 3 (iii), 4 (iv), 6 (vi), 7 (vii), 8 (viii), and 9 (ix)
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Numbers generally
- antilogarithm
- Arabic numeral
- C, c
- D, d
- digit
- infinity
- L, l
- log
- logarithm
- M, m
- mode
- nos
- number
- ordinal
- ordinate
- quantitative
- Roman numeral
- serial number
- variable
- whole number
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