Here are the definitions I'm using:

hu·man
n.
A member of the genus [censored] and especially of the species H. sapiens.

adj.
Of, relating to, or characteristic of humans

life | a·live
n. / adj.
The property or quality that distinguishes living organisms from dead organisms and inanimate matter, manifested in functions such as metabolism, growth, reproduction, and response to stimuli or adaptation to the environment originating from within the organism.

per·son
n.
1. A living human.
2. The composite of characteristics that make up an individual personality; the self.
3. A human or organization with legal rights and duties.

So, to summarize:

Anything with human DNA is "human" (by the 2nd definition). Any living cell is "alive". A zygote, therefore, is a living human cell.

Since most arguments end up being over semantics, I'd like to clarify that I am asking about the 3rd definition of "person". Specifically, when *should* a human life be granted legal rights. Further, the 2nd definition of "person" is what is being debated -- "when does an individual person - a "self" begin".