偉

အွန်

イ

ခွန်

えら(い)

偉い（えらい）、偉大（いだい）

great, magnificent

On-reading (イ) is used in compounds; kun-reading (えら(い)) is used standalone or with okurigana. This kanji forms verbs/adjectives with okurigana. Practice both the word form and compound forms.