Act 26:5
since they have
known about me for a long time, if they are willing to testify, that I lived
as a Pharisee according to the strictest sect of our religion.
Here the word translated "known" is the same Greek word translated everywhere else as foreknown or known beforehand. Note the idea is to use information from the past (Paul's childhood) to acknowledge Paul was raised as a Pharisee. This has nothing whatever to do with foreseeing the future.
Romans 8:29
For those whom He
foreknew, He also predestined
to become conformed to the image of His Son, so that He would be the firstborn among many brethren;
Note the idea is implementing a plan formulated in the past.
Romans 11:2
God has not rejected His people whom He
foreknew. Or do you not know what the Scripture says in
the passage about Elijah, how he pleads with God against Israel?
Again, note the idea is treating people in the present according to the promised plan of the past.
1Peter 1:20
For He was
foreknown before the foundation of the world, but has appeared in these last times for the sake of you
Again, the redemption plan formulated before creation is being implemented in the present.
2Peter 3:17
You therefore, beloved,
knowing this beforehand, be on your guard so that you are not carried away by the error of unprincipled men and fall from your own steadfastness,
Here our word is translated so the idea of using knowledge acquired or formulated in the past, during the present (being on guard) is clearly presented.
And here are the other two places the related Greek word appears in scripture:
Acts of the Apostles 2:23
this
Man, delivered over by the predetermined plan and
foreknowledge of God, you nailed to a cross by the hands of godless men and put
Him to death.
Here the implementation of a plan formulated in the past can plainly be seen.
1Peter1:2
according to the
foreknowledge of God the Father, by the sanctifying work of the Spirit, to obey Jesus Christ and be sprinkled with His blood: May grace and peace be yours in the fullest measure.
And once again the redemption plan has us being chosen by the sanctifying work of the Spirit, i.e. the Holy Spirit setting us apart in Christ for the purpose of redemption.