A search of the W/H Greek NT and the LXX for μακαριοι οτι using a tool like the Step Bible, say, will reveal that the Beatitudes of Matthew 5 reveal a literary form that is particular, but not exclusive, to Jesus.
The form is:
Blessed (μακαριοι) ... because (οτι) ...
The search is not exhaustive, of course, because verse boundaries prevent instances like Matthew 5:11-12 or Luke 10:23-24 being picked up, but it is sufficient to reveal Jesus' particular use of the form.
So, it is reasonable to conclude that Jesus' use of this form in Matthew 5, is deliberate, and sufficiently exclusive, such that the term "Beatitude" might be used to identify any expression that exhibits the same structure.
The Purpose of the Form
Note that the Beatitudes are bracketed by reference to the "kingdom of heaven" in the first, Matthew 5:3, and the last Matthew 5:11-12. Each need identified in a Beatitude, will find its supply from the kingdom of heaven.
Blessed are the poor in spirit: for theirs is the kingdom of heaven.
Those in need of spiritual sustenance will seek out the kingdom of heaven and be fed (Matthew 6:33). Those who are not in need of such, are sustained by what they've found in the kingdom of earth.
Blessed are they that mourn: for they shall be comforted.
Those in need of comfort when death moves them to sorrow, will seek out the kingdom of heaven in order to find it, since reunion is its principle hope. Those who are not so moved have no such need, taking comfort in what they believe to be the finality of the grave.
Jesus is unmistakeably identifying himself, here, with the same purpose as the prophet, in Isaiah 61. This Beatitude also has particular relevance in regard to the death of Jesus (Matthew 24:30).
Blessed are the meek: for they shall inherit the earth.
The meek, who are not inclined to violence, are vulnerable and in need of protection and will seek out the kingdom of heaven to secure it. Those who are inclined to violence, will seek out their own means of securing protection from the resources available to them in the kingdom of the earth.
Jesus is making reference in this Beatitude to Psalm 37, where the meek are those who rest in the LORD, in contrast to the wicked who prosper their way by bringing wicked schemes to pass. Jesus is also making a connection with Isaiah 11 and his role as the Rod from the stem of Jesse.
I'll leave the exegesis at this point, since exegesis is not the function of this site, and three examples are sufficient to show the purpose of Jesus' particular use of this literary form. The reader can pursue their own study, if they have a mind, to verify how the given pattern continues throughout the passage, and that all the Beatitudes are moving towards the last, Matthew 5:11, which are then rounded off by the statement given in Matthew 5:12.
The text is putting forward the notion that "blessed" refers to the state of being of those who put their trust in God - the pre-eminent physical manifestation of whom, is Jesus. These people have access to the vast riches of the kingdom of heaven, in this life and in the life to come. Whereas, the state of being of those who put their trust in someone/something else, is totally dependent on their immediate circumstances, and the rule of life that governs humanity disconnected from God: exploit or be exploited.