noun, noun which may take the genitive case particle 'no'
good fortune; good luck; auspiciousness
Primarily used in the context of omikuji (fortune slips) to indicate a favorable result. Can also be used more generally for auspiciousness.
See also: 御神籤 (おみくじ)
おみくじで吉が出た。
I drew a 'good fortune' on my omikuji.
今日は吉の方角へ行くと良いらしい。
It seems it's good to go in an auspicious direction today.
noun
unspecified day of the month
Abbreviation of 吉日. Used in formal letters or invitations to obscure the exact date of writing, implying it was written on an auspicious day.
See also: 吉日
手紙の末尾に「吉」とだけ書かれていた。
At the end of the letter, only '吉' was written.
招待状の日付が吉になって
The date on the invitation is given as '吉'.
The kanji 吉 has long been associated with good fortune and auspiciousness in Chinese and Japanese tradition. The reading きち is the standard on'yomi, while きつ is a less common variant.