What elasticity means?

Elasticity, ability of a deformed material body to return to its original shape and size when the forces causing the deformation are removed. A body with this ability is said to behave (or respond) elastically.

How do you say inelastic?

Is it pronounce or Pronunciate?

The correct verb in English is pronounce, not pronunciate. An articulate and well-educated fluent English speaker who used pronunciate as a verb might be assumed to be making a joke.

Do we pronounce the L in world?

Don’t say the ‘r’ in ‘world‘! Not even a tiny bit, it is completely silent as it is followed by a consonant. The ‘l’ in world is dark because it comes after a vowel sound. Your tongue should raise at the back and the front, it is a very soft sound, not like the clear /l/ you find at the beginning of a word.