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Definitions of Si:

noun:   a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
noun:   the syllable naming the seventh (subtonic) note of any musical scale in solmization
noun:   a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)
name:  A surname (very rare: popularity rank in the U.S.: #39223)

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Alternative Terms
gamut yes-song-lyrics pronoun reflexive-pronoun chamorro-language simon sinhalese-language si-3 mpeg dvb shift-out-and-shift-in-characters c0-and-c1-control-codes swarm-intelligence strong-ai samahang-ilokano seletar-institute smithsonian-institution st-ignatius-college-preparatory ancient-domains-of-mystery the-elder-scrolls-iv-shivering-isles sports-interactive signal-integrity silicon sinc-function trigonometric-integral survey-of-india international-system-of-units self-injury sensory-integration postcentral-gyrus sexual-intercourse suicidal-ideation solfege s-song s-latin-album mahican s-dhe-2 situationist-international socialist-international station-inspector statutory-instrument swedish-institute s-s-rv-gur sports-illustrated skynet-airlines spokane-international-railroad sergeant scouting-ireland staten-island systems-integrator solomon-islands s1 s-3-si si-901 si28 roland-si rhe pascal9 inusitate adscititious sciurid fluidity unit watt mole omphalopsychite epinician exa gig