XO

• (extra old): X.O., X.O, X. O.
• (executive officer): X.O., X. O.

XO (not comparable)

1. Initialism of extra old; a grade of premium cognac that has been aged in barrels for more than 6.5 years.

   Coordinate terms: VS, VSOP, VVSOP

(extra old):

• XO sauce

XO (plural XOs)

1. (military, nautical) Initialism of executive officer.

• CO (commanding officer)
• 1O (first officer)
• 2O (second officer)
• 3O (third officer)
• 4O (fourth officer)

XO (plural XOs)

1. Alternative letter-case form of xo (“hugs and kisses”)

   Synonym: xoxo

   • 1998, Elliott Smith (lyrics and music), “Waltz #2 (XO)”, in XO:

     Looking out on the substitute scene / Still going strong / XO, Mom

• Ox, ox, ox-