The International Glossary on Infertility and Fertility Care, 2017, was developed by a global team of experts to create a standardized set of terms and definitions for use in infertility and fertility care. This glossary aims to ensure consistency in reporting on infertility issues and fertility care interventions, as well as to harmonize communication among medical and scientific communities, policymakers, and the public. The glossary includes 283 consensus-based and evidence-driven terms, developed through an inclusive process involving multiple stakeholders from around the world. The glossary was developed in collaboration with several organizations, including the International Committee for Monitoring Assisted Reproductive Technologies (ICMART), the American Society for Reproductive Medicine (ASRM), the European Society of Human Reproduction and Embryology (ESHRE), and others. The process involved multiple working groups, each focusing on different aspects of fertility care, such as clinical definitions, outcome measurements, and epidemiology. The glossary was reviewed and refined by an external expert group, which included representatives from non-governmental organizations. The glossary includes new terms and definitions, such as 'fertility care' and 'fertility awareness', as well as updated definitions for terms like 'infertility'. The definition of 'infertility' has been expanded to include a broader range of conditions affecting the capacity to reproduce. The term 'subfertility' has been replaced with 'infertility' to standardize the definition and avoid confusion. Additionally, the glossary includes definitions for terms frequently used in epidemiology and public health, such as 'voluntary and involuntary childlessness', 'primary and secondary infertility', and 'fecundity'. The glossary provides a consensus and evidence-driven set of terms and definitions that can be used globally to ensure consistency in reporting on fertility care interventions and their outcomes. It is intended to be used by the medical and scientific communities, the lay public, policymakers, and individuals and couples experiencing fertility problems. The glossary was developed to improve communication and understanding of fertility care, and to support the development of policies and practices that promote access to reproductive health care.The International Glossary on Infertility and Fertility Care, 2017, was developed by a global team of experts to create a standardized set of terms and definitions for use in infertility and fertility care. This glossary aims to ensure consistency in reporting on infertility issues and fertility care interventions, as well as to harmonize communication among medical and scientific communities, policymakers, and the public. The glossary includes 283 consensus-based and evidence-driven terms, developed through an inclusive process involving multiple stakeholders from around the world. The glossary was developed in collaboration with several organizations, including the International Committee for Monitoring Assisted Reproductive Technologies (ICMART), the American Society for Reproductive Medicine (ASRM), the European Society of Human Reproduction and Embryology (ESHRE), and others. The process involved multiple working groups, each focusing on different aspects of fertility care, such as clinical definitions, outcome measurements, and epidemiology. The glossary was reviewed and refined by an external expert group, which included representatives from non-governmental organizations. The glossary includes new terms and definitions, such as 'fertility care' and 'fertility awareness', as well as updated definitions for terms like 'infertility'. The definition of 'infertility' has been expanded to include a broader range of conditions affecting the capacity to reproduce. The term 'subfertility' has been replaced with 'infertility' to standardize the definition and avoid confusion. Additionally, the glossary includes definitions for terms frequently used in epidemiology and public health, such as 'voluntary and involuntary childlessness', 'primary and secondary infertility', and 'fecundity'. The glossary provides a consensus and evidence-driven set of terms and definitions that can be used globally to ensure consistency in reporting on fertility care interventions and their outcomes. It is intended to be used by the medical and scientific communities, the lay public, policymakers, and individuals and couples experiencing fertility problems. The glossary was developed to improve communication and understanding of fertility care, and to support the development of policies and practices that promote access to reproductive health care.