Meaning of よければ in Japanese

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Definition of よければ

よければ(yokereba) 【良ければ】

はじめよければおわりよし(hajimeyokerebaowariyoshi) 【始め良ければ終わり良し】

おわりよければすべてよし(owariyokerebasubeteyoshi) 【終わり良ければ総て良し】

あんな妹いもうと達たちでよければ、ノシをつけてさしあげますよ。

If those little brats of sisters are good enough I'll make a gift of them to you!

もし天候てんこうがよければ大だい集会しゅうかいとなろう。

The gathering will be large if the weather be good.

I mean to go tomorrow if the weather is fine.

Weather permitting, let's go on a picnic.

もし体からだの調子ちょうしがよければうかがいます。

I will come provided I feel well enough.

もし体からだの具合ぐあいがよければ私わたしは来ますくる。

I will come provided I am well enough.

Please come to my house next Saturday if you care for it.

もう少しもうすこし記憶力きおくりょくがよければなあ。

I wish I had a better memory.

Wait a second. Do you just think that all's well that ends well? That's not the way it is.

It's OK with me if it's OK with you.