What term describes the predictable way in which learners acquire language features over time?

The term that best describes the predictable way in which learners acquire language features over time is "Acquisition stages." This concept refers to the specific phases or levels that language learners typically go through as they develop their proficiency. Each stage reflects a distinctive set of linguistic capabilities, illustrating the gradual and systematic progression from basic to more complex language use. Understanding these stages helps educators design appropriate teaching strategies and interventions that align with where learners are in their language development journey. This term captures the essence of language learning as a structured process rather than a random occurrence.