国際単位系
Kanji
Readings: コク、 くに
Meaning: country
Readings: サイ、 きわ、 -ぎわ
Meanings: occasion, side, edge, verge, dangerous, adventurous, indecent, time, when
Readings: タン、 ひとえ
Meanings: simple, one, single, merely
Readings: イ、 くらい、 ぐらい
Meanings: rank, grade, throne, crown, about, some
Reading: ケイ
Meanings: lineage, system