He was careful in choosing a bride.
I spent the whole day choosing clothes today.
Please tell me the key points for choosing a suit.
I helped my friend choose the color.
選定 refers to a formal, often official act of selecting something, whereas 選び is a casual suffix used in everyday compounds like 嫁選び.
how to choose; way of choosing; choice
select; pick out
search for a husband for one's daughter; choosing a son-in-law
word choice; choice of words
divination by toddler's choice; birthday divination
Standard kanji spelling for the suffix meaning 'choosing'.
Rare variant kanji; 選び is overwhelmingly more common.
Nominalized form of the verb 選ぶ (to choose), used as a suffix in compound nouns.