Definition of 「靔」:
1. Same as "天" (tiān) - sky, heaven.
(Combining meaning. The form in oracle bone script shows a large frontal human figure at the bottom, indicating a human head above. In small seal script, it is simplified to a horizontal line. Original meaning: the top of a person's head.)
Same original meaning as above, referring to "sky" or "top." ... “Top” refers to the height of a person; thus, it is deemed to signify any height. — From "Shuō Wén Jié Zì Zhù" (A Commentary on the Analysis of Characters).
(Combining meaning. The form in oracle bone script shows a large frontal human figure at the bottom, indicating a human head above. In small seal script, it is simplified to a horizontal line. Original meaning: the top of a person's head.)
Same original meaning as above, referring to "sky" or "top." ... “Top” refers to the height of a person; thus, it is deemed to signify any height. — From "Shuō Wén Jié Zì Zhù" (A Commentary on the Analysis of Characters).