Q: Does the word "air" mean the same thing in "She was humming an air from Beethoven." and "An air of mystery."?

A: different meanings

Q: Does the word "empathize" mean the same thing in "You really have to empathize." and "You really have to empathize with their doing it."?

A: the same meaning

Q: Does the word "concatenation" mean the same thing in "It was caused by an improbable concatenation of circumstances." and "A complicated concatenation of circumstances."?

A: different meanings

Q: Does the word "unravel" mean the same thing in "Stop playing with the seam of the tablecloth! You will unravel it." and "Mother couldn't unravel the ball of wool after the cat had played with it."?

A:
the same meaning