Achillean is an umbrella term used to describe men (including cisgender, transgender, and non-binary individuals who identify with manhood or are masculine-aligned) who are attracted to other men (including cisgender, transgender, and non-binary individuals who identify with manhood or are masculine-aligned).

Here's a breakdown of what that means:

Men Loving Men (MLM): Achillean is often used as a synonym for MLM.

Inclusive Term: It's an inclusive term that encompasses various sexual orientations under the umbrella of men being attracted to other men. This includes gay men, bisexual men, pansexual men, queer men, and other men on the multisexual spectrum.

Not Necessarily Exclusive: An Achillean individual may or may not be exclusively attracted to men. They may also be attracted to other genders. The defining factor is attraction to men.

Counterpart to Sapphic: The term "Achillean" is often seen as a masculine counterpart to "Sapphic," which describes women who are attracted to other women. Both terms aim to be inclusive of various identities within the respective attractions.

Origin in Mythology: The term is derived from Achilles, a hero in Greek mythology whose close relationship with Patroclus has been interpreted by many as romantic or sexual.

In essence, Achillean is a way for men who are attracted to other men to identify, often as a broader and more inclusive term than "gay." It emphasizes the attraction between men and masculine-aligned individuals without necessarily specifying exclusivity.