Longman Dictionary of Contemporary English homepage

I

2 noun
     
Related topics: Letters and punctuation
I2 , i plural I's, i's
1 [uncountable and countable]SLA the ninth letter of the English alphabet
2SLA [countable] the number one in the system of roman numerals
3

I-25, I-40 etc

the name of an interstate (=important road between states in the US)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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