AI Girlfriend Dictionary: 20 Terms New Users Must Know

The first time you open an AI girlfriend app, the settings screen can read like a foreign language. Persona, context window, tokens, OOC, NSFW toggle: each term controls how your companion behaves, what she remembers and what you pay.

You can understand all of them without a technical background. Below are the 20 terms new users ask about most, grouped by what they control. Each entry has a plain definition and a quick example; the examples are illustrations and do not come from a specific app. If you want the bigger picture first, read our explainer on how AI girlfriend apps work.

Terms about the character

These words describe who your companion is before anyone sends the first message.

Persona

The persona is the description that tells the AI who to be: name, age (always an adult), personality, interests, speaking style and relationship to you. Apps with custom companions, such as JOI AI, turn your choices on the setup screen into a hidden persona text.

Example: "Lena, 29, a dry-humored architect who teases gently and asks about your day" is a persona in one line.

Character card

A character card is a saved, shareable persona, often bundled with a picture, greeting and backstory. Many apps offer a gallery of ready-made cards you can start from and edit.

Example: you pick a card called "Bookshop owner" and change her name and hobbies before your first chat.

Greeting

The greeting, sometimes called the first message, is the opening line the character sends. It sets the tone and the scene, so a good greeting shapes much of what follows.

Example: a greeting that opens in a café on a rainy evening will pull the next replies toward that setting.

Archetype

An archetype is a familiar personality template, such as the shy sweetheart, the confident flirt or the supportive best friend. Apps offer archetypes as presets, and you can mix them with your own details.

Example: a "tsundere" preset gives you a character who acts prickly at first and warms up over time.

Memory and context

These terms explain why your companion remembers some things and forgets others.

Context window

The context window is how much recent text the AI can read at once when it writes a reply. Everything inside it shapes the answer; anything that falls out of it is gone unless the app saved it elsewhere.

Example: in a long chat, a detail you mentioned at the start may slip out of the window and stop shaping replies.

Token

A token is a small chunk of text, often part of a word, that language models count and process. Apps measure context windows and some usage limits in tokens, not words or messages.

Example: a long reply uses more tokens than a short one, and that adds up on apps that meter usage by tokens or credits.

Long-term memory

Long-term memory is a separate store of facts the app saves and feeds back into later conversations, so your companion recalls your name or your dog's name next week. Apps differ a lot here; Nectar AI, for example, is one of the tools built around long-term memory.

Example: you mention your sister's wedding on Monday, and on Friday your companion asks how it went.

Memory notes

Memory notes, sometimes called pinned memories, are facts you add or edit by hand. They give you the most reliable way to keep important details, because you decide what gets saved.

Example: you pin "Prefers to be called Sam, works night shifts" so the character keeps it in mind.

How replies are made

These terms describe the engine behind each message.

Language model

A language model is the AI system that writes the replies. Developers train large language models on huge amounts of text, and the model predicts the most fitting next words from the persona, the chat and any saved memory. The Wikipedia overview of large language models is a good primer.

Example: two apps on different models can give the same persona noticeably different voices.

System prompt

The system prompt is the hidden instruction set the app sends with each message: the persona, house rules and style guidelines. You usually cannot see it, but your persona settings feed into it.

Example: if your character starts to sound formal out of nowhere, the app may have changed its system prompt.

Hallucination

A hallucination is when the AI states something false with confidence, including invented memories. The model generates plausible text and does not look facts up, so this happens.

Example: your companion "remembers" a trip you never mentioned. Correct it once and pin the right detail.

Regenerate

Regenerate, also called reroll or swipe, asks the AI for a different version of its last reply. Use it first when an answer misses the tone.

Example: a reply comes out too long, so you regenerate until you get a shorter one that fits the moment.

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Most frustrations with an AI girlfriend have little to do with intelligence. They come down to memory, and memory has its own vocabulary.

Content and roleplay settings

These terms control what kind of conversation the app allows and how you run scenes.

NSFW toggle

The NSFW toggle is a setting that allows or blocks adult themes for adult users. Where apps offer it, they usually tie it to age confirmation, and some keep it behind a paid plan.

Example: with the toggle off, the character steers flirtatious conversations back to safe ground.

Content filter

The content filter, or moderation layer, checks messages and replies against the app's rules and blocks or rewrites anything that breaks them. Apps marketed as uncensored still keep some rules, for legal and safety reasons.

Example: a reply arrives cut short or softened because the filter stepped in.

OOC

OOC means out of character. Roleplayers put a note in brackets to talk to the AI about the story directly, outside the character's voice. Our guide to virtual girlfriend roleplay shows how scene control works in practice.

Example: "(OOC: let's skip ahead to the next morning)" moves the scene without breaking the mood.

Voice and visuals

These terms cover everything beyond text.

Voice call

A voice call lets you talk to your companion out loud and hear a synthetic voice reply, usually through speech recognition plus text-to-speech. JOI AI offers voice calls alongside text chat.

Example: on a walk home you switch from typing to a call and pick up the same conversation.

Image generation

Image generation creates pictures of your character, often called selfies, from prompts or buttons in the chat. For apps focused on visuals, see our guide to AI girlfriend generators.

Example: you ask for a photo of her at the beach, and the app generates one in her established style.

Character consistency

Character consistency means the same face, voice and personality across messages, images and calls. Apps struggle with it because each format often runs on a separate model. Candy AI addresses part of this with an avatar builder and personality presets.

Example: if her hair color changes between two selfies, consistency is weak.

Money and privacy

The last two terms decide what the relationship costs you, in money and in data.

Freemium

Freemium means free to start, with limits that a subscription or credits remove. The limits might cover messages per day, memory, images or voice. Our comparison of free AI girlfriend apps vs paid plans explains where the paywalls usually sit.

Example: the free plan lets you chat, but voice calls and longer memory need an upgrade.

Data retention

Data retention describes how long an app keeps your chats, images and account details, and whether you can delete them. You find the answer in the privacy policy and account settings. The marketing pages rarely say.

Example: an app keeps chat logs until you delete your account, so after a trial you did not enjoy, you use its delete option.

How to use these terms in your first week

The words help most when you test what they describe. A short routine covers most of them:

1. 01Write a persona in two or three sentences and pick a greeting that sets the scene you want.
2. 02Tell the character three facts about you, then check the next day which ones long-term memory kept.
3. 03Pin anything important as a memory note instead of hoping it sticks.
4. 04Use regenerate when a reply misses the tone, and an OOC note when the story needs steering.
5. 05Try one voice call or one image to judge consistency before you pay for media features.
6. 06Read the data retention and deletion section of the privacy policy before you share anything personal.

Bottom line

Most of the vocabulary in AI girlfriend apps answers three questions: who the character is (persona, card, greeting, archetype), what she remembers (context window, tokens, memory), and what she costs you (freemium limits and data retention). Once you know those words, settings screens make sense and you can compare apps on substance instead of slogans.