I Definition

I¹
i
noun Is, I's, i's

1. The ninth letter of the English alphabet.
2. An object or figure shaped like an I. See also I-beam.

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I²
pronoun

1. Used by the speaker or writer to refer to himself or herself, as the subject of an actual or implied verb. Compare me¹.

Etymology: Anglo-Saxon ic.

Info:

After prepositions, the object form me should always be used:

If in doubt, try the phrase without the you, and you will see that for I and with I are not right.

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I³
abbreviation

1. Independent.
2. Institute, or Institution.
3. International.
4. Island, or Isle.
5. IVR.
Italy.

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I⁴
symbol

1. chem.
Iodine.
2. As a Roman numeral: one.

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symbol

1. physics.
Electric current.