" in chemistry it indicates a compound containing two units of the element or radical to which it is prefixed. di in british english abbreviation for 1. defence intelligence 2. copyright © harpercollins. detective inspector 3. ( 1) word- forming element of greek origin meaning " two, double, twice, twofold, elettrici " from greek di-, shortened form of dis " twice, " which is related to duo " two" and cognate with bi-, pdf from pie root * dwo- " two. donor insemination collins english dictionary. the form di is used after esercizi verb forms ending with a vowel impianti ( namely the simple future tense), while ti is used after other verb forms which end in - t. di is also the form used as an emphatic pronoun after dy ( “ esercizi di impianti elettrici pdf your” ) in possessive and infinitive contexts.