“Avakashantar” (often written “avakāśāntar” or “avakasantara”) is a Jain philosophical term.

Broken into parts:

• avakāś / avakash = space
• antar = between / gap

So avakashantar means “space-gap” – the empty space between two things.

In Jain philosophy it is used especially in discussions of:

• Ākāśa dravya (space substance)
• The gap or interval of space that exists between two bodies, or between two space-points (pradeśa).

In simple words: When two objects are separate, the empty space between them is called avakashantar.