(phonology, orthography, grammar) the third row of the 五十音図 (literally “table of the fifty sounds”), consisting of the five kana さ/サ (sa), し/シ (shi), す/ス (su), せ/セ (se) and そ/ソ (so)

what

let's see; what have we got here

Nothing

which (of three or more) / which one /

meaningless

nonsense / meaninglessness

profound, deeply meaningful

semantics (as a field of study), semasiology

(colloquial) Clipping of 意味深長 (imishinchō).