Last Week
noun
The previous week was last week.
せんしゅう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
先週は、私の会社はお休みでした。
Last week, my company was closed.
大きくなったねー。先週はまだあんなに小さかったのに。
You sure have grown a lot! You were still tiny last week though.
先週のクラス休んじゃったから、ノート見せてくれない？
Could you show me your notebook because I didn't go to class last week?