Infinitesimal vs. Infinity

Difference Between Infinitesimal and Infinity
Infinitesimaladjective
Incalculably, exceedingly, or immeasurably minute; vanishingly small.
Do you ever get the feeling that you are but an infinitesimal speck, swallowed by the vastness of the universe and beyond?Infinitynoun
(uncountable) Endlessness, unlimitedness, absence of a beginning, end or limits to size.
Infinitesimaladjective
(mathematics) Of or pertaining to values that approach zero as a limit.
Infinitynoun
A number that has an infinite numerical value that cannot be counted.
Infinitesimaladjective
(informal) Very small.
Infinitynoun
An idealised point which is said to be approached by sequences of values whose magnitudes increase without bound.
Infinitesimalnoun
(mathematics) A non-zero quantity whose magnitude is smaller than any positive number (by definition it is not a real number).
Infinitynoun
(uncountable) A number which is very large compared to some characteristic number. For example, in optics, an object which is much further away than the focal length of a lens is said to be "at infinity", as the distance of the image from the lens varies very little as the distance increases further.
Infinitesimaladjective
infinitely or immeasurably small;
two minute whiplike threads of protoplasmreduced to a microscopic scaleInfinitynoun
(uncountable) The symbol ∞.
Infinitynoun
time without end