student

n. one who is enrolled in a school or college; one who studies, one who researches

The word student is etymologically derived through Middle English from the Latin second-type conjugation verb "stŭdērĕ", meaning "to direct one's zeal at"; hence a student could be described as 'one who directs zeal at a subject'. In its widest use, "student" is used for anyone who is learning.
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Student-Teacher ratio refers to the number of teachers in a school/university with respect to the number of students who attend the school/university. For example, a student teacher ratio of 10:1 means that there are 10 students for every teacher available. The term can also be reversed to be teacher-student ratio.
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Noun
1. a learner who is enrolled in an educational institution
(synonym) pupil, educatee
(hypernym) enrollee
(hyponym) art student
(member-holonym) teacher-student relation
(derivation) study
2. a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines
(synonym) scholar, scholarly person
(hypernym) intellectual, intellect
(hyponym) academician, schoolman

n. student, undergraduate, university student who has not yet received his first degree

n. student, one who is enrolled in a school or college; one who studies, one who researches