Perceptible (adjective)

1. Capable of being perceived by the senses or the mind; noticeable.
2. Able to be perceived or understood.

Origin:

From late latin perceptibilis, from latin perceptus, perfect passive participle of percipere, to perceive.

Examples:

1. The change in temperature was barely perceptible.
2. The sound was just perceptible over the noise of the crowd.
3. The difference in weight is almost imperceptible.
4. The perceptible difference in quality was striking.
5. The perceptible change in the sky indicated a storm was coming.