يسره doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• يسّرهُ Form 2

  2 يسّرهُ ذ , (inf. n. تَيْسِيرٌ, M, &c.) He (God, A, Msb) made it, or rendered it, easy; facilitated it. (M, A, Mgh, Msb, K.) You say, يُسِّرَتْ عَلَيْهَا الوِلَادَةُ The act of bringing forth was rendered easy to her. (…

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