先進国【せんしんこく】
advanced (developed) country, advanced nations
先生【せんせい】
teacher, instructor, master, sensei, title or form of address for a teacher, master, doctor, lawyer, etc., intimate or teasing form of address, one's elder
先月【せんげつ】
last month
優先【ゆうせん】
preference, priority, precedence
先に【さきに】
previously, before, earlier, formerly, recently, first, before (something or someone else), ahead (of), earlier, beforehand, in advance, ahead of time
先頭【せんとう】
head (of a line, group, etc.), front, lead, forefront, vanguard
先輩【せんぱい】
senior (at work or school), superior, elder, older graduate, progenitor, old-timer
先週【せんしゅう】
last week, the week before
先日【せんじつ】
the other day, a few days ago
先端【せんたん】
pointed end, tip, point, cusp (of a leaf, crescent moon, etc.), apex (of a curve), forefront, vanguard, spearhead, leading edge
最先端【さいせんたん】
cutting edge, leading edge, forefront, state of the art, tip, end
先祖【せんぞ】
ancestor, forefather, foremother
先着【せんちゃく】
arriving first
先決【せんけつ】
deciding first, settling (a matter) first, first priority
真っ先【まっさき】
the head, the foremost, beginning, the very front
先駆【せんく】
forerunner, precursor, pioneer, leader, outrider, outriding
祖先【そせん】
ancestor
先例【せんれい】
precedent
行き先【いきさき】
destination, whereabouts, future, prospects
先導【せんどう】
guidance, leadership, leading the way