Polyamory has accumulated a working vocabulary over the last few decades, and most introductory articles either skip it (leaving you confused in conversations) or define it pedantically (without showing how it actually plays out). This is the practical version: what the words mean, how they get used, and why the distinctions matter when you're in the situation rather than reading about it.
The basic terms
Polyamory
Practising or being open to multiple romantic and/or sexual relationships, with the knowledge and consent of everyone involved. The "with consent" part is what distinguishes polyamory from cheating.
Ethical non-monogamy (ENM) / consensual non-monogamy (CNM)
The umbrella term for any non-monogamous relationship structure with consent and transparency. Includes polyamory, swinging, open relationships, relationship anarchy, and others.
Open relationship
A relationship where partners are open to sexual involvement with others but romantic involvement remains primarily with each other. Distinct from polyamory in that romantic exclusivity is usually maintained.
Swinging
Couples (usually) participating in sexual activity with other couples or individuals, often in social/group settings, without the relationships becoming romantically deep. Closer to "open" than to polyamory in shape.
Relationship anarchy
A philosophy that rejects predetermined hierarchies between relationships. Romantic relationships, friendships, sexual relationships are all valid and don't have to be ranked or fit into traditional categories.
Structural terms
Primary, secondary, tertiary
Hierarchical polyamory uses these labels:
- Primary — the central relationship, often live-together, financially intertwined, life-planning partners
- Secondary — significant relationships that don't have the same structural priority
- Tertiary — even less involved relationships, sometimes more casual
Some polyamorous people structure their relationships this way; others reject hierarchy entirely.
Anchor partner / nesting partner
A partner you live with, share life with, perhaps have children with — without necessarily implying hierarchy over other relationships. Used by people who want to describe shared-life partnership without using "primary."
Egalitarian polyamory / non-hierarchical polyamory
Polyamory practised without ranking partners. All relationships are valued on their own terms; structural decisions (who lives with whom, who has children with whom) are made situationally rather than by inherent priority.
Solo polyamory
Practising polyamory without a primary or anchor partner — by choice, not by circumstance. Solo polys often value autonomy and don't seek to escalate any relationship to "primary" structure.
Mono-poly
A relationship between one polyamorous person and one monogamous person. The poly person has multiple partners; the mono person doesn't. Workable but requires significant communication.
Polycule
The network of people interconnected through polyamorous relationships. Your partner's partner is part of your polycule, even if you're not directly partnered with them.
Metamour
Your partner's other partner. You're each other's metamours. Can range from "have never met" to "close friends" depending on the polycule's style.
Style terms
Kitchen-table polyamory
A style where everyone in the polycule knows each other and can comfortably hang out together — like sitting at a kitchen table together. High integration, often friendly between metamours.
Parallel polyamory
The opposite style: each relationship runs in parallel without much overlap. Metamours may not know each other or interact. The polycule exists structurally but not socially.
Garden party polyamory
Somewhere between kitchen-table and parallel — people meet occasionally at events, but don't expect to socialise regularly together.
Hierarchical vs egalitarian (already covered, but worth flagging here)
The presence or absence of formal ranking between relationships is a major style distinction. Hierarchical polyamory has clearer structures but can create power imbalances; egalitarian polyamory is more flexible but requires more navigation in real-time.
Emotional terms
Compersion
The opposite of jealousy: feeling joy or pleasure from your partner's happiness with another partner. Sometimes happens naturally, sometimes cultivated. Not all polyamorous people experience compersion regularly; some report it as the surprising emotional payoff of polyamory.
Jealousy
Polyamory doesn't eliminate jealousy. It treats jealousy as information to be examined rather than as a verdict to be obeyed. Skilled poly practitioners learn to identify what jealousy is actually about — fear of losing connection, insecurity about specific things, unmet needs — and address those rather than just suppressing the feeling.
NRE (new relationship energy)
The intense early-relationship hormonal high. In polyamory, NRE between a partner and a new connection can disrupt existing relationships if not managed. Recognising NRE for what it is — temporary, chemistry-driven — helps polyamorous people not catastrophise about temporary attention shifts.
Limerence
An obsessive infatuation, often confused with love but biochemically distinct. Polyamorous people learn to distinguish limerence (which fades) from sustainable connection (which deepens).
Practical terms
Veto power
An agreement that one partner can "veto" their primary partner's other relationships. Common in early polyamorous transitions; controversial in long-term practice. Vetoing a partner's other relationship can be relationship-damaging in itself; many practitioners eventually abandon veto in favour of more nuanced communication.
One penis policy / one vagina policy
Restrictions on the gender of additional partners — often imposed by a male partner who's comfortable with female partners' female lovers but not male ones, or vice versa. Generally considered an intermediate stop on the path to fuller polyamory rather than a sustainable long-term structure.
Don't ask, don't tell (DADT)
An arrangement where partners are non-monogamous but don't share details with each other. Sometimes used as a transitional structure; can also work for couples who explicitly don't want the information. Distinct from cheating because of the explicit agreement.
Fluid bonding
Choosing not to use barrier protection (condoms etc.) with a specific partner, while maintaining barriers with others. Used as a way of marking specific levels of intimacy or commitment. Comes with sexual health implications that need explicit conversation.
Communication terms
Negotiation
The ongoing process of discussing what each relationship looks like — what's allowed, what's not, what each partner needs. Polyamory requires significantly more deliberate negotiation than monogamy because more is variable.
Boundaries
Things you will or won't do, regardless of the other person. "I won't have unprotected sex with new partners" is a boundary about your own behaviour. Different from rules.
Rules
Things you require of others. "You can't have sex with X" is a rule about another person's behaviour. Polyamorous communities increasingly favour boundaries over rules, because rules create power dynamics that are hard to maintain.
Agreements
Mutually negotiated understandings about how the relationship works. "We've agreed to share STI test results before fluid bonding with new partners" is an agreement.
Common transitions
Opening up
The process of moving from monogamous to non-monogamous. Requires significant communication, often professional support. Couples who open up well usually take their time; couples who rush often struggle.
Closing up
The reverse — moving from non-monogamous back to monogamous. Less talked about but happens regularly. Often after life changes (children, illness, job changes) where the bandwidth for multiple relationships isn't available.
The bottom line
The vocabulary matters because polyamory involves more variables than monogamy, and clear language reduces misunderstanding. Knowing whether you and a partner are talking about kitchen-table or parallel, hierarchical or egalitarian, primary or anchor, makes a real difference in expectations.
None of these terms are required to practise polyamory. Plenty of poly people use casual language and figure things out as they go. But when discussions get nuanced — what to do about jealousy, how to introduce a new partner, what your structural commitments actually are — having the words helps the conversations land more precisely.
Use what's useful; ignore the rest. The vocabulary is a tool, not a test.
