1. not less than ...; ... and over; ... and above; ... and upwards; ... or more
十人以上だ。There are ten or more people.
2. beyond (e.g. one's expectations); above; more than; further than
まあ、必要以上に言っても仕方ないだろう。Well, there's no point in saying more than necessary.
3. the above; the above-mentioned; the aforementioned; the foregoing
以上のことから、次の結論が導かれると思うんです。From the above, I think the following conclusion can be drawn.
4. since ...; seeing that ...; now that ...; once ...
after a verb
やると決めた以上はやる。Now that I have decided to do it, I will do it.
5. that's all; that is the end; the end
説明は以上よ。That's all for the explanation.