i'll admit to not really seeing the analogy as it relates to abortion, but to answer your question... i would consider you dead when you died, not at 1000, 100, or 10 feet.
Fair enough. So being outside of an airplane without a functioning parachute is not imminently fatal at 1000 feet? 100 feet? 10 feet? But it becomes fatally unsafe at zero feet, when you are in fact observably not alive?
When I say 'consider you dead', I mean that for all intents and purposes, you have taken a course of action that will result in you being dead.
Is the analogy getting any clearer?