Zoe is the fact of being alive, not the shape a life takes — closer to aliveness than to biography.
In everyday Greek, zoe just means being alive as opposed to being dead. It covers the life of a plant, an animal, a person, the whole business of existing. It is not, on its own, a technical or spiritual word. A farmer could use it about his cattle.
What makes zoe interesting in the New Testament is what gets attached to it. John's Gospel and letters pair it constantly with aionios, "eternal", and use zoe for the kind of life God has in himself and shares — not extended time, but a different quality of aliveness that death cannot touch. So the same word stretches from a heartbeat to the life of God, and English has no single term that does both jobs without sounding either too plain or too churchy.
In Him was life, and that life was the light of men.
Zoe is identified with the Word himself before any mention of eternity or salvation.
The thief comes only to steal and kill and destroy. I have come that they may have life, and have it in all its fullness.
Jesus contrasts thieves who kill with life given "abundantly", zoe as fullness rather than mere survival.
We were therefore buried with Him through baptism into death, in order that, just as Christ was raised from the dead through the glory of the Father, we too may walk in newness of life.
Paul uses zoe for a new pattern of living, tied to resurrection rather than biology.
Whoever has the Son has life; whoever does not have the Son of God does not have life.
Zoe here is something a person can have or lack entirely, bound up with knowing the Son.
Most English Bibles simply say "life", which is accurate but flattens the contrast Greek writers could make between zoe (aliveness itself), bios (a livelihood, a lifetime's course) and psyche (a person's individual life, often "soul"). Translators reach for "eternal life" when zoe carries aionios, and occasionally "living" or "living beings", but there is no English word that keeps zoe's full range — biological and theological at once — in one term.
A popular but shaky word study claims zoe always means "spiritual, God-kind-of life" while bios and psyche mean lesser, merely biological life — as if the Greek vocabulary itself sorted life into sacred and ordinary bins. It didn't. Zoe is used for plain animal and human existence throughout Greek literature; its theological weight in John comes from the words placed around it, especially aionios, not from the word zoe doing that work alone.
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