all hail

Short definition from Wiktionary

Interjection

1. 1
   Used as a friendly or respectful salutation to acclaim, greet, or welcome someone: (I wish you) all health or good fortune!
2. 2
   Chiefly followed by to (someone or something): used as a salutation to indicate that someone or something is respected or welcome.

Noun

1. 1
   A salutation of "all hail" (interjection sense 1); hence, a salutation indicating respect or welcome.

Verb

1. 1
   To greet or salute (someone) with a cry of "all hail"; hence, to greet or welcome (someone).