Cosmic Era (コズミック·イラ): Abbreviated as C.E., the chronological coordinates in the SEED drama.

Natural person (ナチュラル): An ordinary person who has not been manipulated by genetic factors. Relatively low abilities compared to new humans.

New Humans (コーディネーター): Humans born from the operation of genetic factors, their minds and bodies are better than natural people, and most of them live in the experimental colonization satellite "PLANT" as space immigrants, mainly responsible for space development, but the conflict between them and natural people is also becoming more and more intense.

United Earth Forces: Oppose Militancy Neutralize Invasion Enforcer, or "OMNIE" for short, is a group in which both the Atlantic Federation, which built Gundam, and the Eurasian Federation, which has the military satellite Artemis, participate.

PLANT (プラント) :P acronym for roductive location ally on nexus technology, a next-generation artificial celestial facility located in the L5 Celestial Domain, and the main place where new humans live. It has an hourglass-shaped appearance, which is very different from the old type of colonial satellites. The dish-shaped sections at each end are the living quarters, the ring-shaped mirrors collect sunlight for use, and the spaceport is located at both ends of the axis of rotation. PLANT is made of organic matter and has a beautiful natural environment. About 200,000 people live in one plant.

ZAFT Army (ザフトArmy): The acronym of the Zodiac Alliance of Freedom Traty, the army of the new human (PLANT), divided into two parts: the Space Army and the Earth Army, with MS as the main combat weapon.

Bloodstained Valentine's Day (血のバレンタイン): In C.E. 70, the United Earth Army launched a nuclear attack on the agricultural colony satellite "Unius 7" in order to contain and eliminate the "PLANT" that was beginning to embark on the road to independence, and all 243721 people on the "Unius 7" at that time died (Aslan's mother was among them), which directly led to the outbreak of war between the United Earth and PLANT. To commemorate this tragedy, the New Humanity erected a memorial monument on the wreckage of Junius 7.

Gundam (ガンダム): An acronym for the General Unilateral Neuro-Link Dispersive Autonomic Maneuver, known as the "G" by the United Earth Forces.

Alaska (アラスカ): Located in the northwest of North America, it is the headquarters of the United Earth Forces.

GAT: An acronym for Gressorial Armament Tactical. Among them, the X100 series is a basic Gundam with a fixed structure; The X200 series is a Gundam obtained by applying special armor based on the X100 series. The X300 Series is a new type of Gundam with a variable structure that is completely different from the above series.

Heliopolis (ヘリオポリス): A colonial satellite owned by the neutral nation of Orb, whose name is derived from the name of the City of the Sun in ancient Egyptian mythology. The United Earth Forces had planned to test and develop the "G" series here, but it was discovered by the ZAFT Army, and Heliopolis was destroyed after the two armies fought.

Neutron jamming (ニュートロン·ジャマー): Similar to the Minovsky particle in the official history of Gundam, it can suppress nuclear fission reactions and interfere with electromagnetic waves and radar communications.

Gravel Belt (デブリベルト): The word "デブリ" comes from French and means "snow blocks", which refers to abandoned artificial satellites and waste from space development. This garbage floating in space forms an orbital zone around the Earth. The wreckage of Julius 7, which was destroyed in the tragedy of "Bloodstained Valentine", is also among them.

Junius 7 (ユニウスセブン) :P an agricultural satellite colony of LANT, which was destroyed by a nuclear attack by the Combine on the occasion of "Valentine's Day", and the wreckage drifted in the rubble belt.

Artemis (アルテミス): A military fortress owned by the European Federation in L3, named after the name of the moon god in ancient Greek mythology. Artemis has a full-perimeter light wave defense zone commonly known as the "Artemis Umbrella", which can withstand all attacks from the outside, but on the contrary, it cannot attack from the outside. In the absence of enemies around, the all-around light wave defense zone does not expand. Later, Nichol used the Mirage System to infiltrate the interior of the fortress, destroying the entire surrounding light wave defense system, and the entire fortress was then destroyed.

L1~L5: that is, five Lagrange points (Lagrange is a French mathematician and astronomer in the 18th century, Lagrange points were first calculated by him), Lagrange points are the balance points of gravity between the earth and the moon, and the objects at these points can have a stable orbit, so it is an ideal place to build space colonies. L1 and L2 are in the periphery of the Moon; Artemis Fortress and Heliopolis in L3 position; The United Earth Force fortress is located at L4; PLANT is located at L5 in its own country.

Phase Transfer Armor (フェイズシフト Armor): A special armor that is standard with the GAT series, and when deployed, negates the damage of physical bullets. However, the price of high defense is a drastic reduction in the mobilization time, so it is generally not deployed during non-combat.

Blue cosmos (ブルーコスモス): A naturalistic group of natural people who regard the new humans as "human beings who violate the laws of nature", and therefore advocate the exclusion of the new humans, and the radicals among them even openly resort to assassination.

APU: An acronym for Asist Power Unit, which means "Auxiliary Power Unit".