What does 10-4 mean?

10-4 in Community Dictionary

10-4 implies "OK," "understood," and "affirmative." Often called CB radio lingo, via the need for brevity in radio transmission. by Shawnee AganReport definition
APCO 10-code for "I understand your transmission" by BridgettReport definition
An acknowledgement by Derek PresseyReport definition
1: noun, ten·fourPhrase utilized as acknowledgement, either in the beginning or the end of a meeting between buddies; may be used instead of hey or goodbye successfully.2: adjectiveUsed to spell it out mood, person, or celebration; indicating above average or rather good. by Joseph JohnsrudReport definition
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