-blast. A suffix meaning an immature precursor cell of the type indicated by the preceding word. [G. blastos, germ]. immature precursor cell type; the cell type is denoted by the preceding syllables, e.g. osteoblast.
(plural defining moments) A moment in time that defines something, such as a person's success or failure, achievement or demise, talent, etc. A point at which the essential nature or character of a person, group, etc., is revealed or identified.
Actually, being in the moment means being mindfully aware of what is going on right here and now, in our experience, and this includes any thinking we do about the past or future. Much of the time our experience does not have this quality of awareness or mindfulness.