Hybridization is a way to explain molecular shapes that can't be explained easily by considering simple overlap of the s and p orbitals. If only these simple atomic orbitals were involved in bonding, all bond angles would be the same as those between the p orbitals (all 90°). Hybridization is a mixing of valence atomic orbitals to give a new set of orbitals that reflect the (correct) geometry of the molecule.

When two species are crossed with each other to give rise to another new species then this process is called hybridization.

Hybridization is the crossing of dissimilar individuals to produce best of both organisms. One advantage of hybridization is that it can combine disease resistance of one organism with the production capacity of another. 

In chemistry, it is the formation of bonding orbitals from electrons in atomic orbitals. In biology it means the formation of a hybrid offspring, perhaps a different color wing on a butterfly, which gives it a better chance of survival.