Meaning of 通婚 in Japanese

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Definition of 通婚

つう(tsuu) 【通】

(adj-na, n) connoisseur; authority
コーヒー通の人達に結構評判がいいそうです。
I hear that it has quite the reputation with coffee connoisseurs.
(ctr) counter for letters, notes, documents, etc.

よばい(yobai) 【夜這い ·婚 ·婚い】

(n, vs) creeping at night into a woman's bedroom; stealing into a girl's bedroom at night to make love; sneaking visit

くながい(kunagai) 【婚】