0 the fact of being impossible to see, or of not being noticed:
Thus, the visible markers of grey hair, wrinkles, and sagging skin were the physical determinants of social invisibility.
Two teachers (both woodwind, and neither generally in favour of demonstration) cited the invisibility of tonguing technique to reach opposite conclusions.
Unlike opponents in a struggle for survival, the main properties of bacteria are their invisibility, ubiquity, hostility, nonhuman character, and vast numbers.
Within this cloak of invisibility certain clear lines were drawn to ensure that proper boundaries were maintained.
We hope that the compiler's speed can be improved to the point of invisibility so that it can be used by non-programmers in image editors.
The end thus plays with two motifs: visibility and invisibility, what is and is not represented, what is and is not sung.
An identity of refractive index with that of their surroundings is probably the reason for their invisibility.
The conviction that there existed a body in this particular direction could not be shaken by its invisibility.
