What is the meaning of efficient?

1 : productive of desired effects especially : capable of producing desired results with little or no waste (as of time or materials) an efficient worker efficient machinery.

How do you say this word efficient?

Is the F silent in often?

Why? Often has a medial /t/ that, like similar words such has “hasten” and “soften,” was once pronounced and is now typically silent. Unlike the similar words, pronouncing the “t” in “often” has returned in some modern usage.