Tumescence (noun)

1. The state of being swollen or distended, especially as a result of being filled with blood.
2. A state of growing in size or swelling.

Origin:

Late 17th century from french tumescence from latin tumescens swelling from tumescere to begin to swell.

Examples:

1. The tumescence of the leaves meant they were getting the water they needed.
2. His tumescence was a sign that he was sexually aroused.
3. The tumescence of the dam caused it to burst.
4. The tumescence of the fruit indicated that it was ready to be picked.
5. The tumescence of the muscle was due to the blood flow increase.