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"Key to success" is a common phrase that includes the word key.
The Skeleton Key.
Less than
Echoing is a key phrase or word is a way to establish a firm connection. You can find more general business terminology on internet.
Echoing a key phrase or word
Sypher means key word or phrase and riddle or a puzzle
The word could be crux, focus, essence, or core.
To seek attention to that phrase or word
keyword is a single word may be it organic or inorganic but when it comes with bunch as two or three words it is called as key Phrase. If you wish to target for specific product or Article or website you should have to use key phrase to get better ranking in SE and relevant users.
The Key Word or Phrase Delivery Outline, see the link below.
Full speed v3.6 unlock key
For Google Adword tools one will type a key word or phrase and then they will see what pages the ad word is on. Basically they are a way to get a top placement in ad searches.