Definition of k-essence:
(n) :
(colloquial) thousand or thousands.
(n) :
The SI measurement value of 1,000
(n) :
(colloquial) kilometre or kilometres.
(n) :
(computing) A kilobyte (more formally KB or kB).
(n) :
(computing) A kilobit (more formally kb), especially in measuring Internet connection.
(n) :
(computing) A single character message used as an acknowledgement (ACK), meaning "previous message received and understood."