The only free and comprehensive online etymological dictionary of the Spanish language
inglés (Adjective, Noun) "English;" "English person"
From Middle English Inglis "English" with the ending -is analogous to the native noun-forming suffix -és.
Also the origin of the surname Inglés, given to immigrants from England.
iniciar (Verb) "to begin"
18th cent. From Latin initiare 'id.' From initium "beginning" (see inicio).
Indo-European
Romance
Portuguese iniciar, Galician iniciar, Catalan iniciar, French initier, Italian iniziare
inicio m. (Noun) "beginning"
20th cent. From Latin initium 'id.' From inire "to go into." From in- "in" (see en-) and ire "to go" (see ir).
Indo-European
Romance
Portuguese início, Catalan inici, Italian inizio
injerir (Verb) "to graft;" "to insert"
Very late 13th cent. Old Spanish enxirir. Reflexive use of the word to mean "inserting one's self" beginning in the 18th cent. From Latin inserere 'id.,' from in- (2) and serere "to plant," "to sow." From Proto-Italic *si-s-e/o- 'id.' From Proto-Indo-European *si-seh1- 'id.,' a reduplication of *seh1 "to sow."
Indo-European
Balto-Slavic
Old Church Slavonic sěti "to sow," Russian séjatʹ "I sow," Polish siać "I sow," Lithuanian sė́ti 'id.,' Latvian sēt 'id.'
injerto m. (Noun) "graft"
13th cent. From the Old Spanish participle of injerir.
inmediatamente (Adverb) "immediately"
From inmediato and -mente, an adverb-forming suffix.
inmediato (Adjective) "immediate"
From Late Latin immediatus 'id.' From in- "in" (see in- (2)) and mediatus "halved by the middle," "divided in twain" (see mediar).
Indo-European
Romance
Portuguese imediato, Catalan immediat, French immédiat, Italian immediato
inmunidad f. (Noun) "immunity"
16th cent. From Latin immunitatem, accusative of immunitas "freedom," "immunity," but more literally "no-duty." From the negation prefix in- and munus "duty." See común.
inocente (Adjective) "innocent"
From Latin innocentem, accusative of innocens 'id.' From in- "not" (see in- (1)) and nocens "wicked," "harmful" (see nocente).
Indo-European
Romance
Portuguese inocente, French innocent, Italian innocente, Romanian inocent
inteligente (Adjective) "intelligent"
Very early 17th cent. From Latin intellegentem, accusative of intellegens 'id.' From inter- "between" (see inter-) and legere "to read" (see leer).