Canadian Labour Arbitration Glossary

A plain-language reference for the terms that come up in grievances, step letters, collective agreements, and arbitral awards across Canada.

About this glossary

Canadian labour arbitration has its own vocabulary. Much of it is shared with common-law employment law, but some terms — like culminating incident, duty of fair representation, and policy grievance — are specific to the unionised context. The definitions below are short, plain-language explanations for stewards, business agents, and labour relations officers. They are not exhaustive, and the precise meaning of any term in a given case will depend on the wording of the collective agreement, the relevant statute, and the facts.

Sertus is built by the co-author of Canadian Labour Arbitration(Brown & Beatty), the reference text Canadian arbitrators cite. This glossary is general information, not legal advice — consult counsel for any specific matter.

Terms A–Z

Adjudication
A decision-making process in which a neutral third party resolves a dispute between the parties. In federal public service labour relations, adjudication is the term used for what is called arbitration in most other Canadian jurisdictions.
Arbitration
The binding resolution of a grievance by a neutral arbitrator (or board of arbitration) after the parties have exhausted the grievance procedure in the collective agreement. Arbitration awards are generally final and subject only to limited judicial review.
Arbitrator
The neutral decision-maker who hears a grievance and issues a binding award. Arbitrators in Canada are typically selected from a roster of experienced labour relations lawyers, academics, and former judges.
Bargaining unit
The group of employees represented by the union under a particular certification. The scope of the bargaining unit is set out in the certification order issued by the labour relations board.
Bumping
The right of a more senior employee facing layoff to displace a less senior employee in a different position. Bumping rights and the mechanics of their exercise are set out in the collective agreement.
Certification
The legal recognition by a labour relations board that a union has the right to represent a defined group of employees for collective bargaining. Certification is the starting point for unionisation in Canada.
Collective agreement
The negotiated contract between a union and an employer that governs terms and conditions of employment for bargaining unit members. The agreement is the central reference point for grievances.
Culminating incident
The final event in a pattern of misconduct that triggers discharge. Under the culminating incident doctrine, arbitrators consider the employee's full disciplinary record alongside the final incident when deciding whether the employer had just cause.
Decertification
The revocation of a union's bargaining rights, usually on application by employees in the bargaining unit. The process is governed by the applicable labour relations statute.
Duty of fair representation
The statutory obligation of a union to represent all bargaining unit members fairly, in good faith, and without arbitrariness or discrimination. Alleged breaches are typically pursued at the labour relations board.
Estoppel
A doctrine that prevents a party from enforcing a strict reading of the collective agreement when it has, through its conduct, led the other party to believe a different interpretation would apply. Estoppel is a common argument in grievances about past practice.
Fact-finding
A neutral process in which a third party investigates a dispute and reports on the facts, usually with recommendations. Fact-finding is sometimes used in interest disputes (bargaining impasses) rather than grievance arbitration.
Grievor
The employee (or, in policy grievances, the union) on whose behalf a grievance is filed.
Interest arbitration
Binding arbitration used to settle the terms of a new collective agreement when the parties cannot reach agreement through negotiation. It is most common in the public sector, where strikes and lockouts are often restricted.
Just cause
The standard an employer must meet to justify discipline or discharge of a unionised employee. Canadian arbitrators apply a multi-part framework considering misconduct, proportionality, procedural fairness, and mitigating factors.
Lockout
An employer action that closes workplace access to employees during a collective bargaining dispute. Lockouts are generally lawful only in specified circumstances under the applicable labour relations statute.
Mediation
A voluntary process in which a neutral third party helps the parties reach a negotiated resolution. Unlike arbitration, mediation does not produce a binding decision unless the parties agree to one.
Labour relations statutes (OLRA, BC Code, CLC, and others)
The provincial and federal statutes that govern unionised labour relations in Canada, including the Ontario Labour Relations Act (OLRA), the British Columbia Labour Relations Code, and the federal Canada Labour Code (CLC). Each jurisdiction has its own statute with broadly similar content.
Past practice
A long-standing workplace practice that may inform how an ambiguous clause of the collective agreement is interpreted. Past practice can also ground an estoppel argument.
Policy grievance
A grievance filed by the union (or, in some cases, the employer) that challenges a practice, policy, or interpretation of the collective agreement affecting the bargaining unit as a whole rather than a single employee.
Progressive discipline
A disciplinary approach that escalates through increasingly serious sanctions (counselling, verbal warning, written warning, suspension, discharge) to give the employee a chance to correct their behaviour. Canadian arbitrators generally expect employers to follow progressive discipline.
Ratification
The formal approval of a negotiated collective agreement by the members of the bargaining unit (and, on the employer side, by the relevant authority). Ratification is usually the final step before a new agreement takes effect.
Recall rights
The right of laid-off employees to be recalled to work in order of seniority when positions become available. The duration and mechanics of recall are set in the collective agreement.
Seniority
An employee's length of service, typically used as the basis for rights to promotions, layoffs, recall, vacation scheduling, and other benefits. Seniority clauses are one of the most frequently grieved parts of any collective agreement.
Steward
A bargaining unit member elected or appointed to represent fellow employees in workplace matters, including at the early steps of the grievance procedure.
Strike
A collective withdrawal of labour by employees during a bargaining dispute. Strikes are generally lawful only in specified circumstances under the applicable labour relations statute.
Unfair labour practice (ULP)
Conduct by an employer or union that violates the labour relations statute — for example, interfering with a union certification drive, or retaliating against an employee for union activity. ULPs are typically pursued at the labour relations board.
Voluntary recognition
An employer's voluntary recognition of a union as the bargaining agent for a group of employees, without going through a certification application. Voluntary recognition is less common than certification but remains a valid route in most Canadian jurisdictions.
Work-to-rule
A form of job action in which employees perform only the work strictly required by the collective agreement and their job descriptions, declining voluntary tasks. The legality of work-to-rule depends on whether a lawful strike position has been reached.
Wrongful dismissal
A common-law claim by a non-unionised employee for damages arising from dismissal without reasonable notice. Wrongful dismissal is pursued in the civil courts and is distinct from a unionised grievance about just cause, though the underlying legal concepts overlap.

Why the shared vocabulary matters

A shared vocabulary is how business agents, stewards, and labour relations officers communicate across unions, employers, and jurisdictions. When the steward in Halifax and the business agent in Edmonton both talk about a “culminating incident” or “past practice,” they mean the same thing, and Canadian arbitrators will analyse both cases through the same framework. That consistency is what makes Canadian labour arbitration a coherent national field despite the different statutes in each jurisdiction.

Sertus uses this vocabulary throughout the platform — in grievance intake, step letters, AI drafts, and case analysis — so that records produced by the platform read the way an arbitrator expects them to read.

Next steps

If you want to see how Sertus uses this vocabulary in real cases, book a demo. See also our pages on grievance management, the collective agreement navigator, and arbitration decisions research.

Last updated: April 2026

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