Meaning of the Sanskrit Word: amrtatvaya

  amṛtatvāya—for liberation    Bg 2.15
  amṛtatvāya—for eternal life    SB 3.24.38
  amṛtatvāya—the eternal life    Adi 4.23
  amṛtatvāya—for becoming eternal    Madhya 8.89
  amṛtatvāya—for becoming eternal associates of the Lord    Madhya 13.160

Can't find any compound Sanskrit words containing amrtatvaya.