The only free and comprehensive online etymological dictionary of the Spanish language
misión f. (Noun) "mission"
13th cent. From Latin missio "sending." From missus "sent," perfect passive participle of mittere (see meter) with abstract noun-forming suffix -io (see -ío).
Indo-European
Romance
Portuguese missão, French mission, Italian missione, Romanian misiune
mismo (Adjective) "same"
12th cent. Old Spanish meísmo, meesmo, mesmo. From Vulgar Latin *medipsimus 'id.' Evidently from an unattested Latin word *metipse "the same" with a superlative suffix -isimus added for emphasis (see -ísimo). *metipse is from met- "self" and ipse "himself" (see ese). Met- is probably connected to the ablative form of ego (Old Latin met; see yo).
Indo-European
Romance
Asturian mesmu, Portuguese mesm, Galician mesmo, French même, Italian medesimo, Sardinian matéssiu
mitad f. (Noun) "half"
12th cent. Old Spanish meitad, meatad. Borrowed from Latin medietas 'id.' From Latin medius "middle" (see medio) and noun-forming suffix -tas (see -dad).
Indo-European
Romance
Portuguese metade, Catalan meitat, French moitié, Italian metà, Romanian jumătate, Sardinian meidade
mocho (Adjective) "hornless," "bald"
First record is from a 12th cent. Arabic document from Toledo in the name Dumínqu Al-Múĝu, which was explained in the 13th cent. as an attempt to render the name Domingo Mocho into Arabic. Otherwise, the earliest attestation in Spanish is from the 13th cent. Perhaps from Vulgar Latin *mutius 'id.,' from Latin mutilus "mutilated," but also "truncated." Of unknown origin.
Also the origin of the surnames Mocho and Mochos.
Basque
Basque mutz, motz "short," "ugly," "bare," borrowed from Vulgar Latin *mutius
moción f. (Noun) "motion"
C. 1864. From Latin motionem, accusative of motio 'id.' Its introduction into Spanish from Latin was likely due to influence from the English language. From the verb movere "to move" (see mover).
moda f. (Noun) "fashion"
Early 18th cent. borrowing from French mode, from Latin modus 'id.' (see modo for further etymology).
modelo m. (Noun) "model"
16th cent. Borrowed from Italian modello 'id.' From Vulgar Latin *modellus "little mode." A diminutive of modus "manner" (see moda).
modo m. (Noun) "manner," "mode"
15th cent. borrowing from Latin modus "manner," but literally "measured." It replaced the native Old Spanish word muedo. From Proto-Italic *medo- 'id.' From Proto-Indo-European *med-o- 'id.' From the root *med- "to measure." See also medir.
Indo-European
Romance
Portuguese modo, Galician modo, French mode, Italian modo, Romanian mod
Italic
Oscan meddíss "magistrate," Umbrian meřs "law," Marrucinian medix "magistrate," Marsian medis 'id.,' Paelignian medix "magistrates," Volscian medix 'id.'
Celtic
Old Irish midithir "to measure," Middle Welsh meðu "to think," meddu "rule," Middle Cornish medhes "to say"
Germanic
Gothic mitan "to measure," Old Norse meta "to evaluate," Old High German mezzan "to measure," Old English metan 'id.' (English to measure)
Hellenic
Ancient Greek μέδομαι (médomai) "to care for"
Armenian
Armenian mit-kʿ "mind"
Indo-Iranian
Young Avestan vī-māδaiiaṇta "they must measure"
mole (1) (Adjective) "soft"
From Latin mollis 'id.' From Proto-Italic *mold-ui- 'id.' From Proto-Indo-European *ml̥d-u̯- 'id.'
Indo-European
Romance
Portuguese mole, Catalan moll, French mou, Italian molle, Aromanian moali, Romanian moale, Sardinian modde
Celtic
Old Irish mell "pleasant," Middle Welsh blydd "soft"
Balto-Slavic
Old Church Slavonic mladъ "young," Russian molodój 'id.,' Czech mladý 'id.,' Polish mɫody 'id.,' Slovene mlȃd, Old Prussian maldai "boy"
Indo-Iranian
Sanskrit mr̥du- "soft"
mole (2) m. (Noun) "mass"
Early 17th cent. From Latin moles "heap." From Proto-Italic *melos- "obstacle," "trouble." From Proto-Indo-European *mel-os- 'id.'