tie, bind, contract, join, organize, do up hair, fasten
結 centers on bringing things together so they stay connected: tying, binding, joining, or organizing into a fixed arrangement. The hair and contract senses are natural extensions of fastening or forming a bond.
結 combines 糸 (thread) with 吉, which likely contributes the sound and the idea of something coming together or being auspicious. The character originally expressed tying with thread.
Thread 糸 and a lucky charm 吉 come together: picture tying a lucky knot with red thread to bind good fortune.
For ケツ, imagine tying a knot so tight it makes a sharp 'kets' sound: kets -> ケツ, and the thread binds everything together.
result; consequence; outcome; effect
marriage
splendid; nice; wonderful; delightful; lovely; excellent; fine
after all; in the end; ultimately; eventually
marriage ceremony; wedding; nuptials
to tie; to bind; to link
conclusion (of an argument, discussion, study, etc.)
formation; combination
conclusion; completion
freezing (e.g. water)
connection; linking; joining; coupling; attaching; junction; concatenation; consolidation (e.g. of company accounts)
end; conclusion
combination; union; joining; linking; coupling
ending; conclusion
crystal; crystallization; crystallisation
conclusion; execution (of a contract); entering (into treaty)
unity; union; solidarity; combination; banding together; teaming up
end; close
concentration (of efforts, forces, etc.); gathering together; regimentation; marshalling; mobilization
union; unity; solidarity
association; society
to be related; to be connected; to be joined together
tuberculosis; TB
conspiracy; collusion
to do up (hair); to dress; to arrange
connection; relation
formation of a (political) party
settlement; an agreement
wrestler of the fourth highest rank
pulmonary tuberculosis
results of a scientific investigation; findings
marriage partner; spouse