This is the 723rd most frequent Hebrew word.
גילה
Joy or rejoicing.
Here 'גילה' means 'revealed' or 'disclosed' and it is used in the context of uncovering information.
גילה את הסוד לחברו הקרוב.
He revealed the secret to his close friend.
In this case, 'גילה' means 'discovered,' referring to realizing new information.
במסיבת יום ההולדת גילה כי הם זמרים מוכשרים.
At the birthday party, he discovered that they are talented singers.
Here 'גילה' relates to 'happiness' or 'joy,' used in the phrase to signify celebratory feelings.