i

The ninth letter of the English alphabet and the third vowel, representing various sounds including the long /aɪ/ as in 'ice', the short /ɪ/ as in 'bit', and the long /iː/ as in 'machine'. As a grapheme, 'I' is unique for being the only single-letter English word that is always capitalized when used as the first-person singular pronoun. It functions as a Roman numeral for 1, a designation for the ninth item in a sequence, an academic grade in some systems, and an abbreviation for interstate highways, current, or intelligence.

• 🇪🇸Novena letra del alfabeto inglés, vocal. Representa varios sonidos distintos. Es única porque, como pronombre 'yo', siempre se escribe con mayúscula. También se usa a menudo como número romano 1, para denotar corriente en física, como noveno elemento en una secuencia o como identificador de persona.

1. The ninth letter of the English alphabet A1 formal

   The uppercase or lowercase character (I, i) that constitutes the ninth symbol in the Latin-based English alphabet, classified as a vowel. It represents multiple phonemes: the long diphthong /aɪ/, the short monophthong /ɪ/, and the tense vowel /iː/ in loanwords. Typographically, the uppercase I and lowercase l can be easily confused in sans-serif fonts, as can the lowercase i and the numeral 1. A distinct feature of i is the dot, known as a tittle, which sits above the lowercase form.

   • The word 'ice' begins with the long I sound.
   • In the word 'bit', the letter I makes a short vowel sound.
   • She dotted the lowercase i with a small heart.
   • The alphabet goes H, I, J after G.
   • Linguists distinguish between the tense and lax pronunciations of I.

   🇪🇸Letra i

2. The Roman numeral for 1 A2 formal

   The symbol I used in the Roman numeral system to represent the cardinal number one (unus in Latin). It serves as the fundamental building block for numbers up to three (I, II, III) and as a subtractive element combined with V and X to represent four and nine respectively. It is widely used in outlines, clock faces, chapter numbering, and formal designations of monarchs, popes, and sequential events.

   • King Henry VIII is read as King Henry the Eighth.
   • Chapter I of the book introduces the main characters.
   • The clock face uses I for one o'clock and II for two o'clock.
   • World War I began in 1914 and lasted until 1918.
   • Pope John Paul I served for only 33 days before his death.

   🇪🇸El numeral romano I

3. A symbol for electric current in physics B2 formal scientific

   The uppercase letter I used as the standard notation for electric current in physics and electrical engineering, measured in amperes (amps). The symbol originates from the French phrase 'intensité du courant' (current intensity). It appears in fundamental equations such as Ohm's Law (V = I × R) and denotes the rate of flow of electric charge through a conductor, calculated as I = Q / t, where Q is charge and t is time.

   • Ohm's Law states that V equals I times R.
   • The current I flowing through the circuit was measured at 5 amperes.
   • He calculated the electric current I using the formula I = Q / t.
   • The wire overheated because the current I exceeded its rated capacity.
   • Alternating current is represented as I(t) = I₀ sin(ωt).

   🇪🇸Símbolo de corriente eléctrica

4. An abbreviation for interstate highways in the US B1 informal american

   The letter I used as a prefix in the United States to designate interstate highways, part of the Dwight D. Eisenhower National System of Interstate and Defense Highways. An I followed by a number (e.g., I-95, I-5, I-10) indicates a controlled-access highway that spans multiple states and is maintained by the federal government. Even-numbered interstates generally run east-west, while odd-numbered ones run north-south.

   • Take I-95 north to get from Miami to Washington, D.C.
   • Traffic on I-405 in Los Angeles is notorious for gridlock.
   • I-10 stretches from coast to coast across the southern United States.
   • The longest interstate is I-90, running from Seattle to Boston.
   • We stopped for gas at a rest area along I-75 in Georgia.

   🇪🇸Prefijo I de autopistas interestatales

The singular first-person subject pronoun in Modern English, used by the speaker or writer to refer to themselves as the subject of a verb.

• 🇪🇸Pronombre personal de primera persona del singular en caso nominativo, usado por el hablante para referirse a sí mismo como sujeto de la oración.

1. First-person singular subject pronoun A1 formal

   Used as the subject of a verb when the speaker or writer is referring to themselves as the performer of an action or the topic of a statement.

   • I think I'd better go now.
   • When they asked me if I wanted the job, I said yes.
   • He and I are old friends.
   • I'm not going to fall, am I?
   • Jen and I went to London yesterday.

   🇪🇸Pronombre personal de primera persona del singular

• me object
• my possessive adjective
• mine possessive pronoun
• myself reflexive