Webster's Online Dictionary
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Definition: DI-

Part of Speech Definition
Expression 1. A prefix, signifying twofold, double, twice.[Websters]
2. Denoting two atoms, radicals, groups, or equivalents, as the case may be.[Websters]
3. A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia-becomes di-; as, diactinic; dielectric, etc.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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"Di-" is a common misspelling or typo for: dip, dis-, dia-, dil-.

Etymology:Di- \Di-\ [Greek di`s- twice; akin to ? two, Latin bis twice. See Two, and compare to Bi-, Dia-. The Latin pref. dis- sometimes assumes the form di-. See Dis-.]. (references)

Definition: DI-

Part of SpeechDefinition
Expression1. A prefix, signifying twofold, double, twice.[Websters]
2. Denoting two atoms, radicals, groups, or equivalents, as the case may be.[Websters]
3. A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia-becomes di-; as, diactinic; dielectric, etc.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Etymology:Di- \Di-\ [Greek di`s- twice; akin to ? two, Latin bis twice. See Two, and compare to Bi-, Dia-. The Latin pref. dis- sometimes assumes the form di-. See Dis-.]. (references)