absehen von
to disregard
To deliberately not take something into account, ignore it, or make an exception.
Wenn wir mal von den Kosten absehen, ist der Plan wirklich gut.
If we disregard the costs for a moment, the plan is really good.

to disregard / to foresee
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to disregard
To deliberately not take something into account, ignore it, or make an exception.
Wenn wir mal von den Kosten absehen, ist der Plan wirklich gut.
If we disregard the costs for a moment, the plan is really good.

'Absehen' is a separable verb. The prefix 'ab-' goes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Ich sehe von einer Anzeige ab.
I decide not to file a complaint.
The meaning of 'absehen' is recognizable from the sentence structure: 'absehen von' means to ignore or disregard, 'es auf etwas absehen' means to target or be after something, and without a complement it means to foresee or to copy.
Sehen wir von diesem kleinen Fehler ab.
Let’s overlook this small mistake.
In the meaning of 'ignorieren' (to ignore) or 'verzichten' (to refrain from), 'absehen' is always used with the preposition 'von' and the dative. The construction is: 'von etwas absehen' (to refrain from/disregard something).
Die Polizei sah von einer Strafe ab.
The police decided not to impose a penalty.
The expression 'es auf jemanden/etwas absehen' (to be after someone/something) is fixed. The 'es' is an obligatory part of the construction, and the target of the intention is in the accusative.
Die Mücke hat es offenbar auf mich abgesehen.
The mosquito is apparently after me.
In the meaning of 'voraussehen' (to foresee), 'absehen' is often used with modal verbs (especially 'können') or in the passive-like form 'ist abzusehen' (can be foreseen/is foreseeable). It usually refers to abstract things like consequences or developments.
Man kann noch nicht absehen, wie sich die Situation entwickeln wird.
It is not yet possible to foresee how the situation will develop.
This meaning is strongly associated with the context of exams or school. You can 'bei jemandem' (from someone) or 'von etwas' (from something, e.g., a note) 'absehen' (copy).
Er hat versucht, bei seiner Nachbarin abzusehen.
He tried to copy from the girl sitting next to him.
to consider
'absehen von' and 'berücksichtigen' are opposites here. If you 'von etwas absehen', you deliberately leave that point out or make an exception. If you 'etwas berücksichtigen', you include that point in the planning or decision. The difference is important with rules, costs, problems, or special circumstances. 'Von den Kosten absehen' means: the costs do not matter right now. 'Die Kosten berücksichtigen' means: the costs are taken into account.

Nach dem Gespräch sieht Anna von einer Beschwerde ab.
After the conversation, Anna decides not to file a complaint.
Bei der Planung berücksichtigen wir auch die Wünsche der Eltern.
When planning, we also take the parents' wishes into account.